Official language: Timeline

500 BC   Darius I of Persia Iran

Throughout history, Iran has been of great geostrategic [i] importance because of its centr ... 

 proclaims that Aramaic be the official language of the western half of his empire.

1290   King Denis of Portugal Denis of Portugal

Denis of Portugal As heir to the throne prince Dinis was summoned by his father to share government resp... 

 decrees that Portuguese be the official language of Portugal Portugal

Portugal, officially the Portuguese Republic is located in southwestern Europe [i] on the Iberian Peninsula [i] ... 

, replacing classical Latin in that capacity.

1696   Polish Polish language

Polish is the official language [i] of Poland [i]. ... 

 replaces Ruthenian as an official language of the Grand Duchy of Lithuania Grand Duchy of Lithuania

[i] /[[13th century]...