Who odered the Jew of sapin to convert to catholicism?

The order for Jews in Spain to convert to Catholicism or face expulsion was issued by the Catholic Monarchs, King Ferdinand II of Aragon and Queen Isabella I of Castile. This decree was part of the Alhambra Decree in 1492, which mandated the expulsion of practicing Jews from Spain unless they converted to Christianity. The decision was influenced by a desire to unify Spain under a single faith and eliminate religious diversity.