In astrology, the first house represents self. It means the appearance, behavior, health, habits are determined in this house.
And the eighth house represents in-laws, death, and rebirth. So what happens when the lord of the first house sits in the eight houses?
When the lord of the first house rules on the eight house, the native’s interest’s incline towards the darker aspects of life. There is a sudden increase in curiosity to know about the mysteries of life and the world. The chances of unexpected events may increase.
However, the influence of the first house lord in the eight houses differs for different planets and zodiac signs. Let us learn one-by-one about these influence by different planets:
Sun In Eighth House/Sun In 8th House
Sun rules over the eighth house of the Leo ascendant and since sun and Leo both signify power and authority, the native has to deal with their own ego and self-esteem. These people have to go through a major transforming event, but since the sun it's ruling, it provides the power to cope with all the events and happenings.https://www.talktoastro.com/article/first-house-lord-in-the-eighth-house