Blanca 'agnus dei' - Juan I Seville

Juan I introduced the Agnus Dei blanca following the dynastic crisis that consumed Castile through the 1380s — a direct consequence of the Trastámara succession dispute and the English-backed claim of John of Gaunt to the Castilian throne. The lamb and banner type drew on overtly religious iconography at a moment when Juan desperately needed to project divine legitimacy after his catastrophic defeat at Aljubarrota in 1385, where his army was routed by Portuguese and English forces, effectively ending his ambitions over Portugal.

Seville's mint was among the most active in producing this type. The billon alloy varies noticeably across surviving specimens, reflecting ongoing debasement pressures during Juan's final years.