According to the Thomas the Archdeacon's 13th century Historia Salonitana, Queen Helen built the churches of St. Stephen and St. Mary in Salona (today's Solin).

Has siquidem ecclesias edificauit et dotauit quedam Helena regina, donans eas Spalatine sedi iure perpetuo possidendas.

Que ob reuerentiam regalium sepulchrorum concesse fuerant quibusdam regularibus ad tempus, qui assidue in eis officiorum ministeria exercebant.

Ibi namque magnificus uir Cresimirus rex, in atrio uidelicet basilice sancti Stephani, tumulatus est cum pluribus aliis regibus et reginis.

[4]Jelena played a central role in uniting Croatian and Latin elements within the Kingdom thus laying the groundwork for her son, Stephen Držislav, to assume sovereignty over the Dalmatian thema (which was under nominal Byzantine rule).