The ethnic Mon viceroy was a top military adviser to King Tabinshwehti and Gen. Bayinnaung of Toungoo Dynasty.
[2] In May 1541, he was appointed viceroy of the province of Martaban (approximately, present-day Mon State) by Tabinshwehti.
He was one of the three top generals (along with Bayinnaung and Smim Payu) in Toungoo's invasion of Upper Burma in 1543–44.
Smim Htaw, who had raised a rebellion in the delta since early 1550, took over the Martaban region.
[7] Though it is unclear as to what happened to Lagun Ein—Chronicles do not mention his name again—he was probably killed by Smim Htaw's men.