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Just a few questions about Byzantine marriage customs.

1. Did they have any particular rules regarding consanguinity? I know there was outrage at Emperor Heraclius marrying Martina, his niece. I ask because, eventually, all the major houses could trace their lineage back to Alexios I.

2. For example, John V Palaiologos, Michael VIII's great-great-grandson was married to Helena Kantakouzenos, who was the great-granddaughter of Michael VIII's daughter, Eirene. In addition, John Kantakouzenos' eldest son, Matthew, married Eirene Palaiologos, a cousin of Andronikos III by his uncle, Demetrius Palaiologos. Were there any objections to this?

3. Regarding the previous example, did they follow certain parts of the Bible closely, like, say, Leviticus (the passage Henry VIII used when trying to divorce Catherine of Aragon)? For example, if, John V Palaiologos marries Helena Kantakouzenos, then dies before the marriage is consummated, would John Kantakouzenos try to marry Helena off to John V's (younger/elder) brother, Michael?*

*: He did exist IOTL. http://en.wikipedia.org/wiki/Michael_Palaiologos_(son_of_Andronikos_III)

I'm sorry if I'm not making any sense, but I'd just like to clear a few things up. I'll try to clarify some points if asked.
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