Captain of Sea and War is a rank in a small number of navies, notably those of Portugal

Portuguese Navy

The Portuguese Navy is the naval branch of the Portuguese Armed Forces which, in cooperation and integrated with the other branches of the Portuguese military, is charged with the military defence of Portugal....

 and Brazil

Brazilian Navy

The Brazilian Navy is a branch of the Brazilian Armed Forces responsible for conducting naval operations. It is the largest navy in Latin America...

, which corresponds to the rank of Ship-of-the-line Captain

Ship-of-the-Line Captain

Ship-of-the-line captain is a rank that appears in several navies...

, or the US and Commonwealth rank of full Captain

Captain (naval)

Captain is the name most often given in English-speaking navies to the rank corresponding to command of the largest ships. The NATO rank code is OF-5, equivalent to an army full colonel....

.


Above: Brazilian Captain of Sea and War rank insignia (Health Corps, Dentist) , worn on the shoulder


Above: Rank insignia of a Portuguese Captain of Sea and War, worn on the lower sleeve