Halmir was the Chieftain of the Second House of the Edain at the time of the Dagor Bragollach.

After that battle, and the capture of Minas Tirith, Halmir called on the aid of Thingol, who sent many Sindarin warriors under the command of Beleg to the aid of the Edain. Together, Halmir and Beleg destroyed a legion of invading Orcs, and gave the southern lands a respite from the defeats in the north. Halmir was succeeded as lord of the Haladin by his son, Haldir of the Haladin.
Encyclopedia entry originally written by atalante_star