Former Baltimore Mayor Thomas D'Alesandro III is being remembered as a unique leader.

D'Alesandro's funeral is underway at St. Ignatius Catholic Church. D'Alesandro's sister, U.S. House Speaker Nancy Pelosi, and his son, Thomas D'Alesandro IV are among the speakers.

D'Alesandro, who led the city from 1967 to 1971, died Sunday at 90.

His tenure included the April 1967 riots following the assassination of Martin Luther King Jr. D'Alesandro chose not to run for a second term.

D'Alesandro appointed a number of African Americans to prominent posts, signed legislation to build new schools and saw the opening of a new police headquarters.

D'Alesandro returned to private law practice and informally advised successors including Martin O'Malley.

"He was a wonderful leader for our city, especially a leader in areas such as racial justice, open housing and in making our city a welcoming place for everybody," Baltimore Archbishop William Lori said.

"(He) just had wonderful stories and (he was) just a wonderful, wonderful man," said David Marshall, a mourner. "(He was) just a treasure to the city of Baltimore."