 <translate> The relevant sentence in the passage is: The bank descends from the Bank of Calcutta, founded in 1806, via the Imperial Bank of India, making it the oldest commercial bank in the Indian subcontinent. So the final answer is the Bank of Calcutta. <yor> Ọ̀rọ̀ tí ó wà nínú àyọkà náà ni: "Bánkì náà wá láti Bank of Calcutta, tí wọ́n dá sílẹ̀ ní ọdún 1806, nípasẹ̀ Imperial Bank of India, èyí tó jẹ́ kí ó jẹ́ báńkì oníṣòwò tó dàgbà jùlọ ní agbègbè India. Nítorí náà ìdáhùn tí ó pé ni Bank of Calcutta. 