सोरियपुरम्मि णयरे, आसी राया महिड्ढिए । वसुदेव ति णामेणं, रायलक्खण संजुए ॥२२.१॥
In the city of Śoryapura there lived a king of great splendor named Vasudeva, endowed with royal marks.
The chapter opens in Śoryapura — the Jain name for the ancient city linked to the Yādava clan, corresponding roughly to the city known in other traditions as Mathura or Śauriapura. Vasudeva is the patriarch of the line who sets the genealogical stage. In Jain cosmology, he is one of the nine Vāsudevas — a class of supremely powerful heroes who appear in each cosmic cycle alongside the nine Baladevas and nine Prativāsudevas. The dynasty of Śoryapura is the precise historical-cosmological setting into which the 22nd Tīrthaṃkara is born. By opening with this lineage, the text roots a story of cosmic renunciation in a thoroughly specific human family.
The simple version: In the city of Śoryapura there ruled the splendid king Vasudeva — the patriarch of the Yādava line in Jain narrative.