The IAU Division C Commission 55, Communicating Astronomy with the Public, played an active role in Union affairs within Division C, Education, Outreach and Heritage. The International Astronomical Union (IAU) vested considerable responsibility for its public outreach efforts in Commission 55 (C55), Communicating Astronomy with the Public. This article briefly recounts the origin and history of C55 over the past decade, and describes the work of C55 until it became Division C Commission C.C2 in 2015. As stated on our website, http://www.communicatingastronomy.org, C55 was founded on the principle that “it is the responsibility of every practising astronomer to play some role in explaining the interest and value of science to our real employers, the taxpayers of the world.” While this was true a decade ago, when the Working Group that eventually became C55 first took shape, it is even more true today, when funding for the astronomical sciences (and science more generally) is under threat on nearly every continent.