This thesis deals with two types of coins minted in Dorestad during the reign of Lothar I (840-855), and with their production and its organisation. The hoards of Tzummarum II, Roermond and...Show moreThis thesis deals with two types of coins minted in Dorestad during the reign of Lothar I (840-855), and with their production and its organisation. The hoards of Tzummarum II, Roermond and Westerklief II, made it possible to do an intensive die-study on both coin types (Type 1 and Type 2). A comparison between the created die-chains of Type 1 showed a change in the metrological aspects and designs of these coins. The hhXRF analysis of the coins of Type 1 showed a degradation of the silver content from around 90 to 60% over time. This is in contrast to the coins of Type 2, of which the silver content remained 90%. The emperor’s name and title were always written incorrectly, unlike the mint name Dorestad. This fact implies deliberate wrongly spelling of the name and title of emperor and may be interpreted as making a statement against Lothar I from the Viking(s) that kept Dorestad as a beneficium. The metrological characteristics and designs of the die-chains of Type 1 strongly suggest that these coins were all struck in the same workshop. A cautious estimation of the coins of Type 1 is 4.2 million and 190,000 coins of Type 2. The extended chaîne opératoire was developed to theorize the steps within the production of coins in an attempt to better understand this process. It shows that the production of a coin consists of three different phases, which can change independently from one another. The four parameters by Costin on the late medieval coin production were applied in order to help to understand how coin production could have been organised in Dorestad.Show less
Archaeobotanical investigation of the amount of salt-influx in the Rhine estuary, on material from sites between Dorestad and Katwijk, dating between AD 500 and AD 1500.
