The first written account of Ecser is from December 15, 1315, although the village already existed as of 896, when the Magyars arrived into their present-day country.
Ecseri küla on esmakordselt kirjalikult mainitud 15. detsembril 1315, kuid küla eksisteeris juba 896. aastast, mil ungarlased saabusid nende praeguseaegse riigi territooriumile.