I'll postpone my vote until you edit 4 or 5. If I have to pick from the choices available now... I would pick the last one...
My explanation is that Mor had only female children. Three, in fact, the first of which died at the age of 7. His wife was the daughter of the chief of the local sheep herders. That particular clan was named Kelvin... Mor's wife was often called Lady Kelvin. After Mor's death, she took over the running of the city. She lived a long life and was a shrewd and successful leader for the fledgling community. She never remarried. In her old age, she named her eldest daughter to succeed her... and so the matrilineal line was born. There have also been times when men have been the leader's of Mor's End... but more often it has been women.
(a) because she descends from the original Lady Kelvin, who was Erekh's grandmotherfusangite said:If we accept that the people who founded the city are men named Mor and Erekh,
(a) why is the ruler named Kelvin?
(b) why would a city founded by two men set up a matriarchy?
I like the sound of this. It's nice because it fits the indigenous pastoralists back into the city history. So, you'd favour a succession scheme whereby the ruler selects his/her successor from amongst her/his possible legitimate heirs?
(a) because she descends from the original Lady Kelvin, who was Erekh's grandmother
(b) she originally got the position because she was most qualified and neither Mor nor Erekh wanted to deal with the day-to-day administrivia of running a city
In a word... Yes (to rulers choosing their successor). One of my ideas was that the indigenous herdsmen later became the landed gentry of the area... and some became the noble class in the city. By the way... they herd Argali Sheep... which can grow to 5 feet... and have incredible horns. They also can produce milk (similar to goat)... and wool (medium quality).
As an aside, it's indeed very plausible to have an unbroken line of women. Some X chromosomes actually treat the Y as foreign DNA, and excise it/disable it (this isn't precisely correct, but it's close enough). If this happens in a fertilized egg, you get an XY woman (which can lead to hermaphroditism). If the Y chromosomes are destroyed en route to the egg, then only X chromosomes are able to fertilize the egg, and you only get daughters. This is a trait carried by the mother, and means that she will probably pass it on to half her children. So it's very possible to have all females. This could have developed into a matriachy.