A royal heir assuming (a place of power).
Being in control; superiority, or commanding influence; ascendancy.
An ancestor.
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.
Ascent; height; elevation.
Surpassing or controlling.
Rising, moving upward.
Ruler or monarch of a grand duchy.
Son or grandson of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian would be grand prince.)