Ascendant
/əˈsɛndənt/
noun
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.”
adjective
Rising, moving upward.
Surpassing or controlling.