The Hindu-Arabic Numerals c12.28

c12.28

¹ On the commercial activity of the period, it is known that bills of exchange passed between Messina and Constantinople in 1161, and that a bank was founded at Venice in 1170, the Bank of San Marco being established in the following year. The activity of Pisa was very manifest at this time. Heyd, loc. cit., Vol. II, p. 5; V. Casagrandi, *Storia e cronologia*, 3d ed., Milan, 1901, p. 56.