Rhodian was a humanoid race on Rhodia. They were at war against the Quill.
Biology
to be added
Culture
The Rhodians were a cultured, learned society. Homosexuality was more accepted than on 21st century Earth. (TV: For Tonight We Might Die)
History
All but one of the Rhodians were destroyed by the Shadow Kin: Charlie, their prince, who was brought by the Twelfth Doctor to Coal Hill Academy. (TV: For Tonight We Might Die)