To act as a flagship for.
The most important one out of a related group.
The ship occupied by the fleet's commander (usually an admiral); it denotes this by flying his flag.
The ship regarded as most important out of a group, e.g. a nation's navy or company's fleet.
To rule over; to domineer.
A ruler of other rulers.
A feudal lord directly owed rent or personal service by a tenant of subinfeudated land, a tenant's liege lord.
Anyone with overarching power or authority in a given domain.