These plaques were probably used to decorate the outer surface of the stupa like Paharpur & Mainamati.
Although he was a Buddhist and a renowned patron of Buddhism, he was also very sympathetic to Vaishnavite teachings (according to the two copperplates discovered at Mainamati).
The archeological site used to be a part of Samatata kingdom in historical Bengal, and is part of a series of archeological sites that includes Mainamati and Somapura Mahavihara in Bangladesh .
Much of what is known of him comes from the copper plates from Mainamati as well as the plate discovered in the village of Paschimbhag in Moulvibazar detailing his successful campaign against the Kingdom of Kamarupa.
Traillokyachandra established the dynasty, centered at Devaparvata (near Mainamati, Comilla) and expanded into modern Kachua Upazila before declaring himself as Maharajadhiraja.