In retribution for a notable lie told by Queen Astydameia about Peleus, they assisted in the destruction of Iolcus.  
One of them was killed by a son of Aphareus who was the husband of Ares's granddaughter Marpessa.  In retribution for a notable lie told by Queen Astydameia about Peleus, they assisted in the destruction of Iolcus.  A temple to them was erected at Lake Regillus, where they were thought to have helped the Romans to victory. Among their exploits was the abduction of the wife of Aegeus, Aethra, in retaliation for the kidnapping of their sister.  After abducting and marrying Hilaeira and Phoebe, one of them was killed by Idas and Lynceus, the nephews of Leucippus.  One of them was a noted rider, while the other excelled at boxing.  FTP, name these mythological sons of Leda and brothers of Helen who are immortalized in the constellation Gemini.
One of them was killed by a son of Aphareus who was the husband of Ares's granddaughter Marpessa.  
the Dioscuri or Castor and Polydeuces or Castor and Pollux (accept Gemini before it is mentioned)