1/2 Groat - Martin I Barcelona

Martin I, "the Humane," inherited the Crown of Aragon in 1396 following the extinction of the direct Aragonese male line — he was the last ruler of the House of Barcelona. His reign saw persistent monetary instability driven by plague-depopulated trade networks and the ongoing costs of suppressing Sardinian revolt. The Barcelona mint operated under strict municipal oversight during this period, which accounts for the relatively consistent fineness across issues despite political turbulence.

Martin died without a legitimate heir in 1410, triggering the Interregnum and eventually the Compromise of Caspe, which placed the Castilian Trastámara dynasty on the Aragonese throne.