In Jun 1255 Llewellyn "Last" Aberffraw (age 22) defeated his brothers Owain "The Red" Aberffraw (age 23) and Dafydd ap Gruffudd Aberffraw Prince of Wales (age 16) during the Battle of Bryn Derwin. Owain "The Red" Aberffraw (age 23) and Dafydd ap Gruffudd Aberffraw Prince of Wales (age 16) were both imprisoned.