Inge the Younger was King of Sweden in 1110–1125 and the son of king Halsten and he was probably Halsten's youngest son. According to unreliable traditions Inge would have ruled together with his brother Philip Halstensson

Philip of Sweden

Philip was King of Sweden 1105–1118, a son of King Halsten Stenkilsson.Philip and his brother Inge the Younger ruled together from 1105 or 1110 and onwards as successors of their uncle Inge the Elder. According to the Westrogothic law he was a good king. Little else is known about him...

 after the death of their uncle Inge the Elder

Inge I of Sweden

Inge the Elder was a King of Sweden.-Biography:Inge was the son of the former King Stenkil and a Swedish princess. Inge shared the rule of the kingdom with his probably elder brother Halsten Stenkilsson, but little is known with certainty of Inge's reign...

:

Hallstein's sons were Philip and Ingi, and they succeeded to the Kingdom of Sweden after King Ingi the elder. (The 13th century Hervarar saga

Hervarar saga

Hervarar saga ok Heiðreks is a legendary saga from the 13th century combining matter from several older sagas. It is a valuable saga for several different reasons beside its literary qualities. It contains traditions of wars between Goths and Huns, from the 4th century, and the last part is used as...

)

Other sources say that after the death of Philip (1118), Inge the Younger was the sole king of Sweden, but the year of his own death is unknown. According to the regnal list in the Westrogothic law, Inge was poisoned with an evil drink in Östergötland

Östergötland

Östergötland, English exonym: East Gothland, is one of the traditional provinces of Sweden in the south of Sweden. It borders Småland, Västergötland, Närke, Södermanland, and the Baltic Sea. In older English literature, one might also encounter the Latinized version, Ostrogothia...

:

Niunði war Ingi konongær, broðher Philipusær konongs, oc heter æptir Ingæ kononge, Halstens konongs brødhær. Hanum war firigiort mæð ondom dryk i Østrægøtlanði, oc fek aff þy banæ. Æn Sweriki for e wæl, mædhæn þer frænlingær rædhu.

The tenth (Christian king) was king Inge, the brother of king Philip, and he was named after king Inge (the Elder). He was killed by evil drink in Östergötland and it was his bane. But Sweden fared forever well, while these kinsmen ruled.

It is not known whether Inge was still alive when the Norwegian king Sigurd I of Norway

Sigurd I of Norway

Sigurd I Magnusson , also known as Sigurd the Crusader , was King of Norway from 1103 to 1130. His rule, together with his brother Eystein I of Norway , has been regarded by historians as a golden age for the medieval Kingdom of Norway...

 invaded Småland

Småland

' is a historical province in southern Sweden.Småland borders Blekinge, Scania or Skåne, Halland, Västergötland, Östergötland and the island Öland in the Baltic Sea. The name Småland literally means Small Lands. . The latinized form Smolandia has been used in other languages...

 in 1123, but when Inge died, it was the end of the House of Stenkil

House of Stenkil

The House of Stenkil was a dynasty on the Swedish throne from c. 1060 to c. 1125. Stenkil probably originated from Västergötland.Line before Stenkil, according to the Norse sagas:...

.

Inge is reported to have been married to Ulvhild Håkansdotter who was the daughter of the Norwegian Haakon Finnsson and who would later marry the Danish king Nils Svensson

Niels of Denmark

Niels of Denmark was King of Denmark from 1104 to 1134, following his brother Eric Evergood, and is presumed to have been the youngest son of king Sweyn II Estridson. Niels actively supported the canonization of Canute IV the Holy, and his secular rule was supported by the clergy...

 and even later the Swedish king Sverker the Elder.