Tetarteron - Manuel I Komnenos Thessalonica

Manuel I ruled for 37 years, but the Thessalonica mint operated with considerable autonomy from Constantinople, producing fabric and style variations distinct enough that specialists still debate exact attributions within the BMC 86–90 range. Thessalonican tetartera from this reign consistently show rougher flans than their capital counterparts — not a product of carelessness, but of a secondary mint working with locally sourced copper under less rigorous supervision.

Manuel's aggressive western policy, including his failed attempt to reassert Byzantine control over southern Italy in the 1150s, demanded sustained military expenditure that pushed provincial mints like Thessalonica to increase output.