"Civilization: Call to Power (CivCTP) is a PC turn-based strategy game developed by Activision as a successor to the extremely successful Civilization computer game by Sid Meier. It was ported to Linux by Loki Software.
A sequel, Call to Power II, was released 18 months after the original. The sequel could not have "Civilization" in its title because Activision did not have a license for the "Civilization" name for a second game."
Source: Wikipedia, "Civilization:_Call_to_Power", available under the CC-BY-SA License.