1.7 The Update that Changed the World

1.7.2, the first release of The Update that Changed the World, is a major update to Minecraft (Java Edition) released on October 25, 2013, which added many new biomes, new generated structures, new flowers, stained-glass, better networking, new commands and more.

A pre-release for 1.7.2 was released earlier on October 25, 2013, though the full release of 1.7.2 is identical to this pre-release.

Source : Minecraft Wiki