|Died||In 133 AC, Fair Isle|
|Book(s)||Fire & Blood (mentioned)|
During Lady Johanna Lannister's war against the ironborn, she hoped to retake Fair Isle from the Red Kraken, and Ser Erwin was given command of a ragtag fleet of fishing boats and cogs at Feastfires, along with Lord Tarbeck and Lord Prester. A hundred knights and three thousand men-at-arms were at their command, but someone had betrayed them, and the longships were waiting. Ser Erwin's head was sent back to Casterly Rock afterward, with Lord Greyjoy calling it "payment for his uncle."
Erwin's relation to the main branch of House Lannister is unknown.
- Fire & Blood, Under the Regents - War and Peace and Cattle Shows.