On 27 February 1219, he witnessed the making of an alliance between Asti and the Marquis Enrico II del Carretto directed against the commune of Alba.
[1] The exact date when Giordano arrived in the Kingdom of Sicily is unknown, but he and several other relatives of Bianca Lancia (died 1246) went there in the service of Frederick II.
Meeting with the leaders of the allied towns of Arezzo and Pisa at Empoli, Jordan was convinced by Farinata degli Uberti not to attack Florence itself, Siena's chief enemy and a centre of Guelph power.
On 4 September, the Sienese army, depending largely on the German mercenaries, met the Florentine on a hill outside Siena in the Battle of Montaperti.
Brunetto Latini's Il Tesoro portrays Jordan wishing rather to die than endure further mutilation and then talking to his own severed hand, which, the encyclopaedist points out, dubbed many knights in its day.