Pietro della Vigna, (also Pier delle Vigne, Petrus de Vineas or de Vineis; c. 1190–1249), was an Italian jurist and diplomat, who acted as chancellor and secretary (logothete) to Emperor Frederick II. Accused of lèse majesté, he was falsely imprisoned and committed suicide soon after. He is mentioned in The Divine Comedy by Dante Alighieri.
Read more about Pietro Della Vigna: Life and Work, Imprisonment and Suicide, In The Divine Comedy