In January 1500—shortly after the victorious entry of the French into Milan—Leonardo left that city in the company of mathematician Lucas Pacioli. After visiting Mantua in February 1500, in March he proceeded to Venice, where the Signoria (governing council) sought his advice on how to ward off a threatened Turkish incursion in Friuli. Leonardo recommended that they prepare to flood the menaced region. From Venice he returned to Florence, where, after a long absence, he was received with acclaim and honoured as a renowned native son. In that same year he was appointed an architectural expert on a committee investigating damages to the foundation and structure of the church of San Francesco al Monte. A guest of the Servite order in the cloister of Santissima Annunziata, Leonardo seems to have been concentrating more on mathematical studies than painting, or so Isabella d’Este, who sought in vain to obtain a painting done by him, was informed by Fra Pietro Nuvolaria, her representative in Florence.