Every version of the story agrees on the essentials: on 26 June 1284, in the town of Hamelin in Lower Saxony, a mysterious piper — dressed in bright, multicoloured "pied" clothing that marked him as an outsider — led 130 of the town's children out through the East Gate toward a hill known as the Koppenberg, where they vanished without trace. The earliest surviving written account, the Lüneburg manuscript, dates from roughly 1440–50 — over 150 years after the event, but still medieval, and notably consistent in its core details with what a 1300 stained-glass memorial window in Hamelin's Market Church (destroyed in 1660, but documented in surviving descriptions and copies before its loss) had already commemorated.
Most tellingly, Hamelin's own town records contain an entry from 1384 stating simply: "It is 100 years since our children left." A street near the town centre, Bungelosenstrasse — "street without drums" — is traditionally held to be the children's last known location, and local custom forbade music and dancing there for centuries in their memory.