This is an exceptionally odd case of the bug where a vassal has the same title tier as his liege. Most commonly a count with another count as vassal, but I've seen a duke with an archbishop as vassal, and this is the first king-under-king example I've seen.
I know exactly how the duke-archbishop situation came about. The first bishop (count-level) title the archbishop held happened to be in the region of a particular duke, so when I handed out that duke title the archbishop was included among the vassals to the new duke. It's a bug, since the archbishop title was not taken into account like a pre-existing duke-level title should be, but at least it's clear how it happened. How or if this translates to the various count-under-count examples is not clear...
I suspect that the Il-Khanate becoming a Cuman vassal is similar to the duke-archbishop case above. After several decades of war, the Il-Khanate has migrated to the point of existing entirely in the region between the Black Sea, Volga, and Don (capital now in Kasogs, I believe) - territory associated with the King of Cuman title, as I recall. Again, why the game allowed a same-tier vassalization to come about is puzzling, especially since this one had to be a voluntary or diplomatic vassalization.
I know exactly how the duke-archbishop situation came about. The first bishop (count-level) title the archbishop held happened to be in the region of a particular duke, so when I handed out that duke title the archbishop was included among the vassals to the new duke. It's a bug, since the archbishop title was not taken into account like a pre-existing duke-level title should be, but at least it's clear how it happened. How or if this translates to the various count-under-count examples is not clear...
I suspect that the Il-Khanate becoming a Cuman vassal is similar to the duke-archbishop case above. After several decades of war, the Il-Khanate has migrated to the point of existing entirely in the region between the Black Sea, Volga, and Don (capital now in Kasogs, I believe) - territory associated with the King of Cuman title, as I recall. Again, why the game allowed a same-tier vassalization to come about is puzzling, especially since this one had to be a voluntary or diplomatic vassalization.
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