Shiva Purana
अयस्य पुत्रो वैतण्डः श्रमः शांतो मुनिस्तथा ॥ ध्रुवस्य पुत्रो भगवान्कालो लोकभावनः ॥ २५॥
Aya’s sons are Vaitaṇḍa, Śrama, Śānta and Muni. Dhruva’s son was lord Kāla influencing the worlds.
english translation
ayasya putro vaitaNDaH zramaH zAMto munistathA ॥ dhruvasya putro bhagavAnkAlo lokabhAvanaH ॥ 25॥
hk transliteration by Sanscript