Line 13 is one of the sixteen lines of the Paris Métro rapid transit system. It originated as Line B of the Nord-Sud Company before becoming Line 13 when the Nord-Sud was merged into the CMP in 1930. Line 13 was extended in 1976 to reach one end of Métro Line 14, which was then absorbed into it. (The number 14 was eventually reused for a new line in 1998.)