Point of Dynastic Allies

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What is the point of having dynastic allies? I can't call them into war like regular allies, nor do they ever voluntarily help me out.
The one benefit to them I've noticed is that the AI can call dynastic allies into conflicts, so all my dynastic vassals can call each other into conflicts, allowing my vassals to expand my realm for me much more easily than they could by themselves.
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What is a dynastic alliance?
Dynastic marital alliances were agents of at least restricted cultural transfer which made itself felt first and foremost at the courts but also influenced the rest of the country. Dynastic marriages often were an important part of foreign policy, bringing new options, changes in position or international stability.Why did royal families marry each other?
Marriage between dynasties could serve to initiate, reinforce or guarantee peace between nations. Alternatively, kinship by marriage could secure an alliance between two dynasties which sought to reduce the sense of threat from or to initiate aggression against the realm of a third dynasty.What is the dynastic rule?
A dynasty is a sequence of rulers from the same family, usually in the context of a feudal or monarchical system, but sometimes also appearing in republics.Why do royals interbreed?
Incest was a common tactic among royal families to retain power. For the Habsburgs, intermarriage and \u201ca huge amount of inbreeding\u201d protected the family's influence as successive generations occupied the throne of the Holy Roman Empire between the 1400s and 1700s.Sri Lanka's new president to appoint ally of ousted Rajapaksa as PM • FRANCE 24 English
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