Sidroc was a Forthwegian who collaborated with the Algarvian occupiers during the Derlavaian War.and enlisted in Plegmund's Brigade. He was a cousin of Ealstan. At the beginning of the war, Sidroc's home was destroyed and his mother and sister killed in an air raid, forcing Sidroc and his father Hengist to live with the family of his cousins Leofsig and Ealstan (who was Sidroc's schoolmate). Soon afterwards Sidroc was killed during the Algarvian last stand against the Unkerlanter troops breaking into the royal palace, dying for the lost cause he had chosen.