Yalo (Arabic: يالو, also transliterated Yalu) was a Palestinian Arab village located 13 kilometres southeast of Ramla. Identified by Edward Robinson as the ancient Canaanite and Israelite city of Aijalon. During the Middle Ages, it was the site of a Crusader castle, Castrum Arnaldi. Following the 1948 Arab-Israeli War, Jordan annexed the West Bank, including the village of Yalo. Yalo's population increased dramatically owing to an influx of Palestinian refugees from neighbouring towns and villages depopulated during the war.