Giani de Soldanier or Giovanni de Soldanieri was an Italian politician, born in Florence to a Ghibelline family.
He is best known for being found in the 9th circle of hell (canto 32), reserved for those who sin by treachery, by Dante in his epic Inferno.
<blockquote>
I think Gianni de' Soldanier is farther on,
with Ganelon and Tebaldello,
who opened up Faenza while it slept. </blockquote>
Historians hold that while serving as potesta or lord of Faenza, with the help of Tribadello di Zambrasi, he betrayed the town to the Guelfs of Bologna.