Koleluttu developed from Vatteluttu script in the post-Chera/Perumal (c. 12th century onwards) period in Kerala. It was used by certain Kerala communities (such as Muslims and Christians) even up to c. 18th century AD.
^ abK. Rajan (2001). "Territorial Division as Gleaned from Memorial Stones". East and West. 51 (3/4): 359–367.
^ abcdNarayanan, M. G. S. Perumāḷs of Kerala. Thrissur (Kerala): CosmoBooks, 2013. 379-80 and 398.