St. King Louis IX of France was to all accounts a man of exemplary piety and sincere faith. He led two Crusades to regain control of the Holy Sites in Jerusalem and died of illness during the second. He promoted the ecclesial reforms of the Dominicans and Franciscans. Whether or not he actually became a Franciscan tertiary is not certain, but it was for his support of the Franciscan Order that our window was originally installed in the Church of St. Francis in Philadelphia.
He is shown garbed in a robe with the royal symbol, fleur-de-lis and his earthly crown, holding not a scepter of power or an orb, but the Cross of Christ.