Ground billiards is a modern term for a family of medieval European lawn games, the original names of which are mostly unknown, played with a long-handled mallet (the mace), wooden balls, a hoop (the pass), and an upright skittle or pin (the king). The game, which at least three cue-sports historians call "the original game of billiards", developed into a variety of modern outdoor and indoor games and sports such as croquet, pool, snooker, and carom billiards. Its relationship to games played on larger fields, such as hockey, golf, and bat-and-ball games, is more speculative. As a broader classification, the term is sometimes applied to games dating back to classical antiquity that are attested via difficult-to-interpret ancient artworks and rare surviving gaming artifacts.