Dain is Thorin's cousin, a Dwarf from the Iron Hills. Thorin sends a raven to summon Dain and his army to help defend the treasure under the Lonely Mountain from the men and elves after Smaug is slain.
Dain and Thorin join forces with the men and elves to defeat the evil creatures. He is crowned King under the Mountain after Thorin dies in the Battle of Five Armies.
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The great eagles were allies. Beorn was an ally too. And later Dain Ironfoot proved to be an ally.
If you are referring to The Hobbit, then Thorin.But, if you are referring to The Lord of the Rings, then that would Aragon.
The dwarfs resettled the lonely mountain (Erebor) and made it their capital, they forged a strong alliance with the men of Dale (who had helped kill Smaug).
Dain Blanton was born in 1971.
That would be the men of Laketown and the Army of the Elven King. They have taken over the area to prevent the dwarves from getting out to get food. It also prevents Dain's men from joining the group under the mountain.