NRP Adamastor was a small unprotected cruiser of the Portuguese Navy that was launched in 1896 and remained active until being decommissioned in 1933, being the only ship of its class.

The vessel played an important role in the 5 October 1910 revolution in the Kingdom of Portugal, which saw the fall of the monarchy, and later took part in actions in Portuguese Africa during World War I.

[2] The ship had originally been built with money from public subscription in order to restore Portugal's honor after being humiliated by Great Britain in 1890, being prevented from making a land route from its two colonies of Angola and Mozambique.

[5] When the 5 October 1910 revolution broke out in Lisbon, the Portuguese Navy would play an important role, in particular the crew of the Adamastor who rose up simultaneously as a revolt begin in the capital.

Although they defeated the Portuguese and British land forces, Adamastor and another cruiser were sent to the important port of Quelimane, at which point the Germans decided not to attack the city.