reign

a period during which something or somebody is dominant or powerful; "he was helpless under the reign of his egotism"

the period during which a monarch is sovereign; "during the reign of Henry VIII"

royal authority; the dominion of a monarch

have sovereign power; "Henry VIII reigned for a long time"

be larger in number, quantity, power, status or importance; "Money reigns supreme here"; "Hispanics predominate in this neighborhood"