 When Moreno left for Europe on a diplomatic mission in 1811 , his wife and son stayed in Buenos Aires . María wrote many letters to Moreno , with descriptions of ongoing events in the city . Most of them were written when Moreno was already dead ; she did not learn of his fate until the following August , when a letter arrived from Manuel Moreno . She requested a widow 's pension from the First Triumvirate , which was in power by then ; its value was thirty pesos . 
