This thesis examines the sun-gods position in two of the earliest daughter mythologies of Indo-European culture: Vedic and Greek. My underlying question concerns whether or not the Indo-Europeans had ever viewed the sun-god as a major and, if so, why the sky-god instead became prominent. For Vedic mythology, my primary source is the gveda, in which numerous hymns are addressed to the sun-god Srya. The poems of Homer and Hesiod offer the most insight regarding Hlios place in archaic Greek religion, although later works provide additional information. By examining Vedic and Greco-Roman mythology, it becomes clear that the solar deity had already been relegated to a secondary position by late Indo-European culture. The daughter mythologies inherit the sky-god as supreme deity, but the sun-god remains a key figure, bringing light to mortals and gods.