ascendant

/əˈsɛndənt/

Being in control; superiority, or commanding influence; ascendency.

One man has the ascendant over another.

An ancestor (antonym of descendant)

(usu. followed by to) A royal heir assuming (a place of power)

Given his father's ghastly demise, one would not expect such glee from the ascendant to his throne.

Ascent; height; elevation.

The horoscope, or that degree of the ecliptic which rises above the horizon at the moment of one's birth; supposed to have a commanding influence on a person's life and fortune.