Mon-founded, later Khmer-influenced kingdom centered on Lopburi in the Chao Phraya river basin; a major regional political and Buddhist/Hindu cultural center that came under Khmer Empire suzerainty during the Angkorian period (approximately 11th-13th centuries) while retaining its own line of rulers.
Merged with the neighboring kingdom of Suphannaphum in the mid-14th century to form the Ayutthaya Kingdom, traditionally dated to 1351; some accounts have Lavo persisting as a subordinate principality within Ayutthaya into the 1380s.
Covers Lavo/Lopburi as one of the predecessor polities that merged to form Ayutthaya; broad but directly relevant — no dedicated English-language monograph on Lavo alone was found in Open Library.