[Olog-hai]

Emain Macha was the home base of the legendary warrior Cúchulainn, who was basically Ireland’s Hercules (or often compared to the Hulk by modern historians due to his “battle frenzy” giving him a sort of physical transformation).

[SunkenCiv]

Yuppers. The Cattle Raid of Cooley originated more or less in current form in the Middle Ages. Cuchulainn also went by Finn McCool, a character a.k.a. Fingal. The Giant's Causeway was attributed to him in legend.

John Renbourn & Robin Williamson - Finn And The Old Man's House

Stan Rogers - Giant