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After being trained as a military officer, Francis was spotted by King Victor Emmanuel II, who was impressed with the young man's character and learning. Invited by the king to tutor his two young sons, Francis agreed and prepared himself with additional studies. But with the role of the Church in education being a sticking point for many, the king was forced to withdraw his offer to the openly Catholic Francis and, instead, find a tutor more suitable to the secular state.

Francis soon left army life behind and pursued doctoral studies in Paris in mathematics and astronomy; he also showed a special interest in religion and asceticism. Despite his commitment to the scholarly life, Francis put much of his energy into charitable activities. He founded the Society of St....