Francia here.
Started as a duke in ireland. United ireland and become king. A french king son was married to my daughter matrilinearly then pull some plots to install him. Their son became the king afterwards, which is of my dynasty, and luckily he married the queen of england. Their marriage had 2 sons, the 2nd in line was married to my daughter. When the current french king died, the new king faced a war to depose him. He lost and my daughter became the queen consort and so her husband the king. During that time I elected their son to be the heir of ireland. Years after ireland, france, and england became one.
Started as a duke in ireland. United ireland and become king. A french king son was married to my daughter matrilinearly then pull some plots to install him. Their son became the king afterwards, which is of my dynasty, and luckily he married the queen of england. Their marriage had 2 sons, the 2nd in line was married to my daughter. When the current french king died, the new king faced a war to depose him. He lost and my daughter became the queen consort and so her husband the king. During that time I elected their son to be the heir of ireland. Years after ireland, france, and england became one.