>>9753
>>9762
>>9790
I do not think Ysgramor was a dragon, if anything we should take the fact that we meet ysgramor On sovngarde as a clear indication that he was certainly not a dragon.
Now, was he a dragon priest?
>before the Dragon War, the dragon priests held as much power as kings, ruling in the stead of the aloof dragons they worshipped. In Atmora, the priests demanded tribute and set down laws and codes of living that kept peace between dragons and men. In Tamriel, however, they reigned as tyrants and made virtual slaves of the rest of the population
Ysgramor is described as a King, but never explicitly as a Dragon priest, which implies that back in Atmora the Dragon Cult existed alongside a formal monarchy.
In any case, if Ysgramor was indeed a Dragon priest, it would be misleading to relate him to the Dragon cult as we know it existed on Tamriel, and it would be safe to assume that the cult itself became deranged and eventually became an ecclesiarchy.
On another note, as to why this happened, I think it's got to do with the Nature of dragons and their interactions with humans, particularly Alduin's behavior.
Now, this i where the timeline of events gets fuzy because we're dealing with Merethic era events. Dragons, as you know, they live to dominate or to exert their will upon the world and "rule" it. It is only natural a dragon cult to be formed by humans to protect themselves for dragons by acknowledging their dominance over Nirn.
We know that ancient Atmorans worshiped animal totems as placeholder for the Et'ada, (an interesting fact worth noting here is that kyne is called sister-hawk by Feldir the old. and hawks are one of such animals Atmorans worshiped) Dragons of course being beasts were worshiped as totem of a god, can you guess which one that was?
At some point during the Merethic era, things took a turn for the worse as Alduin claimed godhood for himself, partly forsaking his role as world-eater and placing himself at the top of the dragon cult. This must have been the breaking point in which the cult turned from an ecclesiarchy and into a full-blown tyranny. Perhaps this was sparked by the Sucesss of Atmorans in conquering Skyrim and slowly spreading through tamriel, Perhaps Alduin saw that humans would become so "dominant" that they would not need a dragon cult and could stand up to them (that's all conjecture of course).
In the micrososmos of this events. Where the worship of dragons meant a worship of Akatosh by proxy, Alduin's usurpation of godhood (literally reaching heaven by violence through domination and the atrocities of the late dragon cult in his name.) became worship of a single fragment of Akatosh' fractured soul, which of course managed to degrade the god's state of mind even further. It took Kyne's intercession on behalf of Shor/Lorkhan to help humans even out the things and kick Alduin's ass before he decided to resume his role as world-eater and end yet another kalpa (which would have put a spanner in Lorkhan's work, i think).
The temporary defeat of Alduin and the destruction of the dragon cult had the effect of boosting mankind's power on Tamriel for a while as champions of Lorkhan.