A special mass at the Cathedral of Our Lady of the Angels in Los Angeles honored a Catholic archbishop who was slain in 1980 during El Salvador's bloody 12-year civil war.

The service in Spanish on Sunday celebrated Oscar Arnulfo Romero, the Salvadoran cleric who was beloved for his advocacy for the poor.

He would have turned 100 Monday.

The cathedral is displaying artifacts tied to Romero, including a microphone he used and a blood-stained cloth recovered the day he was killed.

A plaza in LA's MacArthur Park is named for Romero.

Many refugees from El Salvador settled in Los Angeles' Westlake and Pico-Union neighborhoods. The area hosted protests against the civil war and has become home to one of the largest concentrations of Central Americans in the United States.