Antonio de Nebrija (1441 – 5 July 1522), also known as Antonio de Lebrija, Elio Antonio de Lebrija, Antonius Nebrissensis, and Antonio of Lebrixa, was a Spanish Renaissance scholar. He was a teacher, historian, poet and astronomer, best known for writing a grammar of the Castilian language. His grammar is often credited as the first published grammar of a Romance language and set the standard for subsequent modern Spanish language grammars.