António Augusto dos Santos
He was retired at the time of the military coup in Lisbon on 25 April 1974 , which overthrew the Portuguese government headed by Marcelo Caetano and would put to an end the Portuguese Colonial War ( 1961-1974 ) shortly thereafter . 
<triplet> the military coup in Lisbon <subj> 25 April 1974 <obj> point in time