The term chronocrator is a transliteration of a Greek term that was used in Hellenistic astrology in order to refer to a planet has been activated in a chart for a certain span of time according to a particular timing technique.
The Greek term chronocrator literally means “time-lord”, because the planet is activated as a lord or ruler in the chart for a specific period of time.
There were several different techniques that were used in the Hellenistic tradition for determining when a planet would be activated as a chronocrator.
The most widespread time-lord technique in the Hellenistic tradition was annual profections. In the most common variation of the technique, a single planet is activated as a time-lord for each year of the native’s life.