João Castelo Ribeiro Gonçalves (October 19, 1937 – December 11, 2016) was a Brazilian politician and lawyer. Castelo served as Governor of Maranhão from March 15, 1979, to May 15, 1982.[1][2] He was born in Caxias, Maranhão, Brazil.
Castelo died in São Paulo, Brazil on December 11, 2016 after complications from a surgery. He was aged 79.[3]
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