Kaluu is a villain who first appeared in Strange Tales Vol.1 148.
Kaluu was born over 500 years ago in the land now known as Tibet.
Kaluu set about to make himself ruler of Kamar-Taj. While Kaluu and the youth together cast a spell that eliminated disease, poverty, and suffering from Kamar-Taj and granted its people immortality.
Shortly the people of Kamar-Taj crowned him as their king. For over a year Kaluu organized the men of Kamar-Taj by making it so powerful none of the Asian conquerors of that time would dare attack it. Kaluu slowly increased his mystic control over the minds of the people of Kamar-Taj so that the youth attempted to warn the people of Kamar-Taj about Kaluu, but Kaluu's magic prevented them from heeding him.
Kaluu paralysed him. Kaluu plotted further conquests and the people of Kamar-Taj mentally called upon mystical forces to defeat Kaluu.
However, Kaluu fled to the dimension of Raggadorr, where he remained for five centuries, increasing his mystical knowledge.
With the population of Kamar-Taj no longer immortal, the youth himself would now age, although at a greatly slowed rate. The youth eventually became the sorcerer supreme of the Earth dimension known as the Ancient One. He trained the disciple who would become his successor, Doctor Stephen Strange.