The Targaryens are from the extinct country of Valyria, unlike the other great houses of Westeros (with the exception of Velaryon).
Unsurprisingly, marriage is a topic that many of the Targaryens' disobedient laws cover. They have a long-standing propensity to take more than one bride at a time, in addition to marrying from within their own family.
Of fact, one of the most important aspects of many communities is burial. The Targaryens stood out in this and many other ways. They were almost never buried, like the majority of their subjects, but incinerated.
The High Septon is undoubtedly one of the most significant individuals in Westeros. One would anticipate him to be treated with reverence as the head of the Faith, even by those seated on the Iron Throne.
The House of the Dragon universe has its own internal coherence, just like the finest immersive franchises.
The Faith is one of those organisations that dominates Westeros. However, not every noble may adhere to its guidelines exactly.
Of course, one of the most noteworthy characters to appear in House of the Dragon and Game of Thrones are the dragons.
Naturally, war is a frequent occurrence in Westeros, and numerous significant conflicts influenced Game of Thrones. Even if these wars are frequently brutal and bloody, at least they are guided by a set of principles that restrain human nature's worst tendencies.
The Targaryens were able to produce some truly nasty kings despite their immense strength (and, to be fair, some good ones).
Though legitimising bastards is not unheard of in Westeros, it is a norm that is only occasionally broken.