If there is present a relationship (combination, bidirectional vision or exchange of zodiacs) between two or more than two planets (out of which atleast one should be the lord of ‘Kendra’ & the other should be the lord of ‘Trikon’) in a birth chart than these planets are said to be constititing a ‘Rajyog’ in Kundli or birth chart. This ‘Raja Yoga’ in Vedic Astrology is said to give benefits to the person concerned related to the houses in which this ‘Raj yog’ has taken place or related to the houses of which the planets constituting ‘Rajyog’ are having a lordship. Rajyog in Kundli doesn’t necessarily mean becoming a king. Usually its benefits are observed in a person’s life when there is mahadasha of one planet and the antardasha of another planet in the person’s life, provided both planets are constituting Rajyog in some way in the person’s birth chart.