See Ambatthala. Geiger thinks (Mhv. Trs.264, n.3) that Therambatthala is the name given to the Ambatthala-
However, probably, the whole of this locality later came to be referred to by this name, for Therambatthala is mentioned (Vism.155, 375; DhSA 187) as the residence of monks, among them, Buddharakkhita and Mahārohaṇagutta.