Vilikaila or Viligaila was one of the 5 elder Lithuania

Lithuania

Lithuania , officially the Republic of Lithuania is a country in Northern Europe, the biggest of the three Baltic states. It is situated along the southeastern shore of the Baltic Sea, whereby to the west lie Sweden and Denmark...

n duke

Duke

A duke or duchess is a member of the nobility, historically of highest rank below the monarch, and historically controlling a duchy...

s mentioned in the peace treaty with Halych-Volhynia

Halych-Volhynia

The Kingdom of Galicia–Volhynia or Kingdom of Rus or Galicia–Vladimir was a Ruthenian state in the regions of Galicia and Volhynia during 1199–1349. Along with Novgorod and Vladimir-Suzdal, it was one of the three most important powers to emerge from the collapse of Kievan Rus'...

 in 1219. He is mentioned as brother of Daujotas

Daujotas

Daujotas was one of the 5 elder Lithuanian dukes mentioned in the peace treaty with Halych-Volhynia in 1219. In the same document Vilikaila is mentioned as brother of Daujotas which leads to believe that Daujotas was the older or perhaps more influential brother. The brothers are not mentioned in...

, which leads to believe he was the younger or perhaps less influential brother. He is not mentioned in any other sources. Tomas Baranauskas

Tomas Baranauskas

Tomas Baranauskas is a Lithuanian historian specializing in the history of medieval Lithuania. He is the author of the book "The Formation of the Lithuanian State"....

, a modern Lithuanian historian, believes that Vilikaila and Daujotas might be sons of Stekšys

Steksys

Stekšys was a duke of Lithuania, killed in 1214 near Lielvārde during an attack against Livonia. He is one of the earliest mentioned Lithuanian dukes. He succeeded Daugirutis, duke killed in 1213...

, a Lithuanian duke killed in 1214.