mission · 40 · Hispania
No source before the seventh century sends James to Spain, and Spanish scholars have argued about it since the sixteenth. The tradition holds that he preached in Hispania, returned to Jerusalem and was beheaded there, and that his body was carried back to Galicia — where a tomb was identified in the ninth century and became, after Rome and Jerusalem, the third pilgrimage of Latin Christendom. This dataset keeps legendary claims and marks them rather than dropping them, and this one is the clearest case of why: the claim is weak and its consequences are among the largest in Western church history.
To preach in the far west of the empire before returning to Jerusalem.
Nothing, in the documentary record; and Santiago de Compostela, in the record of what people did about it.