On 18 February 1071 he fought in the Battle of Pedroso, near the Monastery of São Martinho de Tibães, and his defeat and death led the winning Garcia II to call himself King of Galicia and Portugal.
Pada tanggal 18 Februari 1071 ia berperang di dalam Perang Pedroso, di dekat Biara São Martinho de Tibães, kekalahan serta kematiannya membuat Garcia II yang menang menyebut dirinya sendiri Raja Galisia dan Portugal.