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Germany was called "the stud farm of Europe" because if you needed to set somebody up on a new throne, you could always find an eligible Prince from a small principality there to take the job. Marriage alliances and the pool of desirable spouses among monarchs in Christian Europe was generally restricted to a pool of royal and aristocratic families which nonetheless was international, with their "credentials" being socially useful in multiple countries. Among European royals, marrying across the boundaries of Christian sects was not a deal-breaker for matches, for instance, German Protestant and Catholics were selected for royal titles and matches of Orthodox countries if they were willing to convert.

To some extent, directly on the borderlands of Christianity and Islam, some of these marriage alliances took place. However, this "reciprocity" to my knowledge never extended from say, France to Persia and back, and the system never included monarchs in Sub-Saharan Africa, India, China, Japan, Southeast Asia or the Americas.

What could have made it become a global system?

Also, did an equivalent to the European system operate within the Islamic world? And was there ever a system of royal reciprocity among East Asian states?
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