Early reports of Europeans reaching this area include those of the Venetian Alvise Cadamosto's voyage of 1455, the 14791480 voyage by Flemish-French trader Eustache de la Fosse, and Diogo Cao. In the 1480s this Portuguese explorer reached the Congo River and the lands of Bakongo, setting up the foundations of modern Angola, some 4200 km down the African coast from Guinea-Bissau.
When was Eustache de la Fosse's voyage?
14791480

Spanish was nonetheless the only official language in Galicia for more than four centuries. Over the many centuries of Castilian domination, Galician faded from day-to-day use in urban areas. The period since the re-establishment of democracy in Spainin particular since the Lei de Normalizacion Linguistica ("Law of Linguistic Normalization", Ley 3/1983, 15 June 1983)represents the first time since the introduction of mass education that a generation has attended school in Galician (Spanish is also still taught in Galician schools).
What was the name of the law that enacted this?
Lei de Normalizacion Linguistica ("Law of Linguistic Normalization"

The terminology can also be confusing because a treaty may and usually is named something other than a treaty, such as a convention, protocol, or simply agreement. Conversely some legal documents such as the Treaty of Waitangi are internationally considered to be documents under domestic law.
What's an example of a treaty that is considered internationally to be documents under domestic law?
the Treaty of Waitangi