Entitled: "Grammatica os tenerum pueri, balbum que figurat, scientiarum ceterarum ianitrix". Print created by Cornelis Cort, 1565, showing a middle-aged woman seated in a tall woven chair, holding a long staff and wearing classical robes decorated with the word "Gramatica" and the letters of the alphabet. She is leaning over a young boy, pointing to a book he holds open. An older boy looks on. Behind and around them boys of varying ages are reading and writing. There are two piles of books on either side of the chair, each labeled with a name: Donatus, Diomedes, Priscianus, Palemon, Servius. Behind one of the book piles a hen is crouched protecting two chicks and an egg. In linguistics, grammar is the set of structural rules governing the composition of clauses, phrases, and words in any given natural language. Latin grammar developed by following Greek models from the 1st century BC, due to the work of authors such as Orbilius Pupillus, Remmius Palaemon, Marcus Valerius Probus, Verrius Flaccus, and Aemilius Asper.