The Mystic Marriage of Saint Catherine of Alexandria and Saint Catherine of Siena

The Mystic Marriage of Saint Catherine of Alexandria and Saint Catherine of Siena
By Ambrogio Bergognone
1490
Oil on poplar wood, 73.8 × 51"
National Gallery, London, UK

Wait a sec: Squishy is marrying Saint Catherine of Alexandria and Saint Catherine of Siena at the same time?  I always thought the little guy was Jewish, not Mormon.