佛祖統紀 30.39

30.39

增至二萬歲時。鐵輪王出獨治南洲（俱舍論。金銀銅鐵輪一二三四洲。鐵輪王一洲。金輪王四洲）　增至四萬歲時。銅輪王出治東南二洲　增至六萬歲時。銀輪王出治東西南三洲。

When it increases to twenty thousand years, an iron-wheel-turning king will appear and rule the southern continent alone (The Abhidharmakośa-bhāṣya states: gold, silver, copper, and iron wheels correspond to one, two, three, and four continents; an iron-wheel king rules one continent, a gold-wheel king rules four continents). When it increases to forty thousand years, a copper-wheel-turning king will appear and rule the two continents of the east and south. When it increases to sixty thousand years, a silver-wheel-turning king will appear and rule the three continents of the east, west, and south.