The Legate's Crest of Valor was a prestigious award.
At some point during the 23rd century, Federation Starfleet captain Christopher Pike was awarded the Legate's Crest of Valor. (DIS: "Brother")
During her time on the USS Enterprise, Una Chin-Riley was awarded this medal. It, along with other awards, was listed in her personnel file, in the section "USS Enterprise - NCC-1701 Medals and Decorations". (SNW: "Ad Astra per Aspera")
During the Occupation of Bajor, Cardassian Dr. Crell Moset won this award after accidentally discovering the cure for the Fostossa virus epidemic and saving thousands of Bajorans' lives. (VOY: "Nothing Human")
Given that legate is a Cardassian rank, the award might be Cardassian.