The story
- Proto-Celtic*kaballosder.?
- Latincaballus
- Late Latincaballārius
- Old Occitancavalier
- Italiancavaliere
- Italiancavalleria
- Middle Frenchcavalerie
- English todaycavalry
From Middle French cavalerie, in turn from Italian cavalleria. Recorded in English from the 1540s. Doublet of chivalry.
Etymology from Wiktionary, CC BY-SA 4.0.