Tinalar is an Alethi Shardbearer who sought to duel Adolin in effort to embarrass Adolin's father, Dalinar. Tinalar saw Adolin as a fop with nice clothing. Tinalar lost the duel and was forced to surrender his Shardblade to Adolin.
Complete:This page has sparse information from the books. However, it does contain everything we have on the subject at this time.