MANILA — Aquilino Pimentel Jr., a Filipino lawmaker who helped orchestrate the 1986 People Power Revolution that overturned more than a decade of martial law and ended the dictatorship of Ferdinand Marcos, died on Sunday in Manila. He was 85.

The cause was lymphoma, said a spokesman for his son Aquilino Pimentel III, the former president of the Philippines Senate.

Mr. Pimentel was a human rights lawyer who in a long political career served as mayor of the southern city of Cagayan de Oro, founded a political party and spent decades in the Senate, where he, too, rose to the rank of president. He became a household name in the Philippines when he organized opposition to the Marcos regime.

Mr. Marcos, who governed the Philippines from 1965 to 1986, declared martial law in 1972, ushering in one-man rule for the next 14 years. The regime was marked by corruption, brutality and the excesses of his wife, Imelda Marcos.