Golden hat



Golden hats (or Gold hats) (Goldhüte, singular: Goldhut) are a very specific and rare type of archaeological artefact from Bronze Age Central Europe. So far, four such objects ("cone-shaped gold hats of the Schifferstadt type") are known. The objects are made of thin sheet gold and were attached externally to long conical and brimmed headdresses which were probably made of some organic material and served to stabilise the external gold leaf. The following Golden Hats are known at present:


 * Golden Hat of Schifferstadt, found in 1835 at Schifferstadt near Speyer, circa 1,400-1,300 BC.
 * Avanton Gold Cone, incomplete, found at Avanton near Poitiers in 1844, ''circa 1,000-900 BC.
 * Golden Cone of Ezelsdorf-Buch, found near Ezelsdorf near Nuremberg in 1953, circa 1,000-900 BC; the tallest known specimen at circa 90 cm.
 * Berlin Gold Hat, found probably in Swabia or Switzerland, circa 1,000-800 BC; acquired by the Museum für Vor- und Frühgeschichte, Berlin, in 1996.

Cultural context
The hats are associated with the pre-Proto-Celtic Bronze Age Urnfield culture. Their close similarities in symbolism and techniques of manufacture are testimony to a coherent Bronze Age culture over a wide-ranging territory in eastern France and western and southwestern Germany. A comparable golden pectoral was found at Mold, Flintshire, in northern Wales, but this appears to be of somewhat earlier date.

The cone-shaped Golden Hats of Schifferstadt type are assumed to be connected with a number of comparable cap or crown-shaped gold leaf objects from Ireland (Comerford Crown, discovered in 1692) and the Atlantic coast of Spain (Gold leaf crowns of Axtroki and Rianxo). Only the Spanish specimens survive.

Archaeological context
Unfortunately, the archaeological contexts of the cones are not very clear (for the Berlin specimen, it is entirely unknown). At least two of the known examples (Berlin and Schifferstadt) appear to have been deliberately and carefully buried in antiquity.

Chronology
Although none can be dated clearly, their technology suggests that they were probably made between 1,200 and 800 BC.

Function
It is assumed that the Golden Hats served as religious insignia for the deities or priests of a sun cult then widespread in Central Europe. Their use as head-gear is strongly supported by the fact that the three of four examples have a cap-like widening at the bottom of the cone, and that their openings are oval (not round), with diameters and shapes roughly equivalent to those of a human skull. The figural depiction of an object resembling a conical hat on a stone slab of the King's Grave at Kivik, Southern Sweden, strongly supports their association with religion and cult, as does the fact that the known examples appear to have been deposited (buried) carefully.

Attempts to decipher the Golden Hats' ornamentation suggest that their cultic role is accompanied or complemented by a usability as complex calendrical devices. Whether they were really used for such purposes, or simply presented the underlying astronomical knowledge, remains unknown.

Calendars
The gold cones are covered in bands of ornaments along their whole length end extent. The ornaments, mostly disks and concentric circles, sometimes wheels, were punched using stamps, rolls or combs. The older examples (Avanton, Schifferstadt) show a more restricted range of ornaments than the later ones.

It appears to be the case that the ornaments on all known Golden Hats represent systematic sequences in terms of number and types of ornaments per band.

A detailed study of the Berlin example, which is fully preserved, revealed that the symbols probably represent a lunisolar calendar. The object would have permitted the determination of dates or periods in both lunar and solar calendars.

Since an exact knowledge of the solar year was of special interest for the determination of religiously important events such as the summer and winter solstices, the astronomical knowledge depicted on the Golden Hats was of high value to Bronze Age society. Whether the hats themselves were indeed used for determining such dates, or whether they simply represented such knowledge, remains unknown.

The functions discovered so far would permit the counting of temporal units of up to 57 months. A simple multiplication of such values would also permit the calculation of longer periods, eg. metonic cycles.

Each symbol, or each ring of a symbol, represents a single day. Apart from ornament bands incorporating differing numbers of rings there are special symbols and zones in intercalary areas, which would have had to be added to or subtracted from the periods in question.

The system of this mathematical function incorporated into the artistic ornamentation has not been fully deciphered so far, but a schematic understanding of the Berlin Golden Hat and the periods it delimits has been achieved.

In principle, starting with zone Zi, a sum is achieved by adding a relevant contiguous number of neighbouring sections: Zi .. Zi+n. To reach the equivalent lunar or solar value, from this initial sum must be subtracted the sum of symbols from the intercalary zone(s) within the area counted.

The illustration depicts the solar representation on the left and the lunar one on the right. The red or blue fields in zones 5, 7, 16 and 17 are intercalary zones.

The values in the individual fields are reached by multiplying the number of symbols per zone with the number of rings or circles incorporated in each predominant symbol. The special symbols in zone 5 are assigned the value of "38", as indicated by their number.


 * Example
 * ''Zone 12 is dominated by 20 repetitions of punched symbol No. 14, a circular disc symbol surrounded by 5 concentric circles.
 * ''Thus, the symbol has the value of 20 x 5 = 100.
 * ''The smaller ring symbols placed between the larger repetitions of No. 14 are considered as mere ornaments and thus not counted.

Through this system, the Hats can be used to calculate a lunisolar calendrical system, i.e. a direct reading in either lunar or solar dates, as well as the conversion between them.

The table can be used in the same way as the original Golden Hats. To determine the number of days in a specific time period (yellow fields), the values of the coloured fields above are added, reaching an intermediate sum. If any of the red intercalary zones are included, their sum has to be subtracted. This allows the calculation of 12, 24, 36, 48, 54 and 57 synodic months in the lunar system and of 12, 18, 24, 36, 48, 54 and 57 sun months (ie. twelfths of a tropical year).


 * ''Example
 * To determine a 54 month cycle in the lunar system, the numerical values of the green or blue zones 3 to 21 are added, reaching a sum of 1,739 days. From this, the values of the red intercalary fields 5, 16 and 17 are subtracted, The result is 1739-142=1597 days, or 54 synodic months of 29.5305 days each.

The overall discrepancy of 2 days to the astronomically accurate value is probably the result of a slight imprecision in the Bronze Age observation of synodic and solar month.

Manufacture
The Golden hats known so far are made from a gold alloy containing 85-90% Au, circa 10% Ag and traces of Cu and Sn (< 1% each). They are made of seamless single pieces of gold leaf, hammered to a thinness between 0.25 mm (Schifferstadt) and 0.06 mm (Berlin). Thus, the cones are surprisingly light considering their size. The Ezelsdorf example, measuring 89 cm in height, weighs only 280 g.

Because of the tribological characteristics of the material, it tends to harden with increasing deformation (see ductility), increasing its potential to crack. To avoid cracking, an extremely even deformation was necessary. Additionally, the material had to be softened by repeatedly heating it to a temperature of at least 750 °C.

Since gold alloy has a relatively low melting point of circa 960 °C, a very careful temperature control and an isothermal heating process were required, so as to avoid melting any of the surface. For this, the Bronze Age artisans used a charcoal fire or oven similar to those used for pottery. The temperature could only be controlled through the addition of oxygen, using a bellows.

Considering the tribologic conditions and the technical means available at the time, the production even of an undecorated Golden hat would represent an immense technical achievement.

In the course of their further manufacture, the Golden hats were embellished with rows of radial ornamental bands, chased into the metal. To make this possible, they were probably filled with a putty or pitch based on tree resin and wax - in the Schifferstadt specimen, traces of this have survived. The thin gold leaf was structured by chasing: stamp-like tools or moulds depicting the individual symbols were repeatedly pressed into (or rolled along) the exterior of the gold. Combs were also used.

Exhibitions
The gold hats were first brought together for comparison and set in the broader context of the culture of Bronze Age Europe in a 1999 exhibition in Bonn, Gods and heroes of the Bronze Age: Europe in the time of Odysseus. Normally they reside in separate museums, at Berlin (Museum für Vor- und Frühgeschichte), Speyer (Historisches Museum der Pfalz, the Schifferstadt specimen), Nuremberg (Germanisches Nationalmuseum, the Ezelsdorf one), and Saint-Germain-en-Laye (Musée d'Archéologie Nationale).



Related objects
The golden hats, or more specifically, the sun cult they appear to have expressed or served, are also often seen as connected with a number of other prominent works of Bronze Age or early Iron Age art. These include the Nebra skydisk, which predates them but implies similarly advanced astronomic knowledge, the Mold cape, which is of a similar standard of workmanship and is likely to have adorned a priest or otherwise special individual, the Trundholm Sun Chariot, a clear representation of sun-related beliefs, a variety of Scandinavian petroglyphs, and assemblages like the Bernstorf Gold Hoard, with golden elements originally attached to clothing, or the Eberswalde Treasure, which features similar decorative motifs to those on the hats. The widespread distribution of the Sun cross and similar motifs in Bronze Age central and northern Europe may also be connected.