The Loyumba Shinyen, also termed as the Loyamba Sinyen, is a 12th century written constitution, regulated in the Manipur kingdom during the regime of King Loyumba (1074 AD-1112 AD). A promulgation of the proto-constitution in 429 AD by King Naophangba was reduced to a final format in 1100 AD. Historically, it is the first written constitution, and one of the well recorded antique manuscripts of the kingdom.