This series was in circulation from 1950 - 1962, according to my internet sources. This fellow: "Luís Alves de Lima e Silva, Duke of Caxias, “Nicknamed "the Peacemaker” and "Iron Duke”, was an army officer, politician and monarchist of the Empire of Brazil."

Ah, the Empire. More bio:

In 1823 he fought as a young officer in the Brazilian War for Independence against Portugal, then spent three years in Brazil's southernmost province, Cisplatina, as the government unsuccessfully resisted that province's secession in the Cisplatine War. Though his own father and uncles renounced Emperor Dom Pedro I during the protests of 1831, Caxias remained loyal. Pedro I abdicated in favor of his young son Dom Pedro II.

This was before the Ragamuffin war, about which we will no doubt hear more. If you're wondering what happened to Cisplatina, we must once more remind ourselves - well, I have to remind myself - that I know nothing of the 19th century history of South America. NOTHING. And there's so much!

Cisplatina was a Brazilian province in existence from 1821 to 1828 created by the Luso-Brazilian invasion of the Banda Oriental. From 1815 until 1822 Brazil was a constituent kingdom of the United Kingdom of Portugal, Brazil and the Algarves. After the independence of Brazil and the formation of the Empire of Brazil the Cisplatina province remained part of it. In 1828, following the Preliminary Peace Convention, the Cisplatina province became independent as Uruguay.

Well, now you know.