Adamastor was a cruiser in the Portuguese Navy

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....

. It was built in Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 using the revenue of a national subscription made after the British

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 ultimatum

British Ultimatum

The 1890 British Ultimatum was an ultimatum by the British government delivered on 11 January 1890 to Portugal in breach of the Treaty of Windsor of 1386...

 to Portugal

Portugal

Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

 in 1890. It played an important role in the republican revolution

5 October 1910 revolution

The revolution of 1910 was a republican coup d'état that occurred in Portugal on 5 October 1910, which deposed King Manuel II and established the Portuguese First Republic....

 of October 5, 1910, being one of the two rebelling cruisers. In 1917 the Adamastor was one of two cruisers sent to Quelimane

Quelimane

Quelimane is a seaport in Mozambique. It is the administrative capital of the Zambezia Province and the province's largest city, and stands 25 km from the mouth of the Rio dos Bons Sinais . The river was named when Vasco da Gama, on his way to India, reached it and saw "good signs" that he was on...

 in Portuguese East Africa

Portuguese East Africa

Mozambique or Portuguese East Africa was the common name by which the Portuguese Empire's territorial expansion in East Africa was known across different periods of time...

. The presence of the cruisers was a decisive factor in preventing the Germans continued advance on Quelimane (a vital port) after the German victory at the Battle of Namakura. In 1934 it was decommissioned and sold to the merchant marine.