Dia de Mártires da Liberdade is a national holiday in which country?

Dia de Mártires da Liberdade (Day of the Martyrs of Liberty) is a national holiday in São Tomé and Príncipe. It is celebrated February 3 when, in 1953, the Batepá massacre perpetrated by Portuguese landowners killed hundreds of native people.

https://en.wikipedia.org/wiki/Batep%C3%A1_massacre

Dia de Mártires da Liberdade is a national holiday in Angola.

Even though the page content couldn't be displayed due to filtering, this one is a clean piece of African independence?era history: the holiday commemorates the events of February 4, 1961, when anti?colonial activists launched actions in Luanda that helped ignite the broader Angolan War of Independence.

The Angolan commemoration of colonial uprising actually has a somewhat longer name, Dia dos Mártires da Repressão Colonial, which translates to Day of the Martyrs of Colonial Repression.

https://www.africa-press.net/angola/all-news/angola-celebrates-martyrs-day