Crowley’s Book of Thoth assigns zodiacal domains to the Kings (Thoth Knights), Queens, and Knights (Thoth Princes). Each rulership begins at 21° and ends at 20°.
So, for example, the Queen of Swords begins her reign at 21° Virgo and ends at 20° Libra. At 21° Libra, the Knight (Thoth Prince) rules until 20° Scorpio.
It’ll be fun to superimpose this over your birth chart to see which court cards rule over your natal planets and personal sensitive points.