As per the "Mahawansa" our first king is King Vijaya he is the eldest son of King "Sinhabahu" and "Sinhaseewali" and born in india and after some time  he landed to srilanka with his 700 folowers in 543 BC. he met yaksha clan spenister "Kuweni" she was engaging in textile waving when they meat. and finaly they got married and they become husbund and wife. latery she bore him two chilidran  named "Desala" and "jeewahatta"

but after seven years the advisers and ministers of King vijaya stated that if vijaya wont to be the real king of this country he has to marry a real queen. becourse the kuweni is a yaksha clan women. further they stated that vijaya should marry a priences from india. finaly king Vijaya get rid from kuweni and his two childran.

for further, detals you can view film of vijaya kiweni and gain Nice experiace about anceient srilanka.