Th concept of "devolution" did not exist as there was no written constitution, as is the case even today in Britain.
Sinhala Prakrit itself became known as "Elu", or "Hela-basa" හෙලබස.
Similarly, the name Lanka → Ilankai was adapted during the Cankam period into Dravidian languages, giving its Tamil form Ilankai, .
The Portuguese had captured most of the Western maritime provinces as well as areas near Gokanna, i.e., Trincomalee (named Triquillemele in De Queyroz) and Madakalapuwa, i.e., Batticaloa (Battacilow in William Broedelet's 1692 map).
The Portuguese Captain Major Philippe de Oliveira had captured the Northern peninsula (Jaffnapatuna) and its ruler Sankilli-II ( Cankili Kumaran) in 1619 CE.
`Andra- Tamil' (andara demala, Telegu) was a language of Sri Wickrama Rajasinghe's court, and as many as 1/3 of the Adigars (Chiefs) signed in Andra-Tamil.