The Martian moon of Deimos.
Deimos is the second and smaller moon of Mars, discovered by Asaph Hall, Sr, in 1877. After the Zheronians contacted humanity in 1940, Deimos was claimed by Portugal in 1948.
In 1959, the Portuguese Ministry of Space forbid soldiers stationed on Deimos to visit the Spanish city on Mars, Sanjurjo, a popular place for solidiers to go on leave. In response, the soldiers instigated the Deimos Mutiny of 1959.