Order of Kahless

From Memory Alpha, the free Star Trek reference

The Order of Kahless, named for Kahless the Unforgettable, is one of the most prestigious groups in the Klingon Empire. The recipient is awarded the Star of Kahless from the Klingon chancellor.

In 2375, Martok was inducted into the Order of Kahless for his actions in the Dominion War in a ceremony aboard Deep Space 9. Chancellor Gowron presided over the ceremony. (DS9: "When It Rains...", "Tacking Into the Wind")