John I, † 526; from Tuscany; introduced the Alexandrian computation of the date of Easter; led an embassy to Constantinople to discuss Emperor Justin I's policy toward Arians in the East; not satisfying the demands of Theodoric, the Arian king in Ravenna, and not knowing his fate, he died there, a wretched man, ill and worn out from his travels; buried in Rome, his epitaph salutes him as a "victim for Christ.