White names: are vassals of the domain they are written in. Some clans having hordes of vassals while others don't relies on wether their masters were successful enough to go down in history, and they themselves distinguish themselves during their rise. In reality, most clans had hosts of vassals.
Shimazu: is at this point in civil war between two branches of the family. The renowned Iriki-in family sided with the losing branch, but were pardoned and made themselves famous by their valiant service during the Sekigahara campaign, 50 years later.
Oda: is also suffering internal conflict between the Kiyosu branch(Nobunaga) to the south and the Iwakura branch to the north. Through even this, the unlikely character that Nobunaga was, struggled his way up to the top. It's worth to note that officially, the Oda were themselves vassals of the Shiba clan, however they had held no true power since the early sengoku.
Mizuno and Miyake: are worth to note as sharing provinces with the Oda and the Matsudaira(later Tokugawa) respectively, and competing there for domination. This area was much splintered, like central Kinai and many other places, and further illustrates the bewildering level of division Japan was in at the time.
Ikko-Ikki: -controlled areas exists in Northern Ise(bordering the Oda), in Izumi and Kaga. The communities in Izumi are strongly supported by the Suzuki, and northern Ise is in great turmoil.
Ôuchi and the Shôni: are just about to be overthrown by their own vassals, Shôni by the Ryûzôji in 1553, Ôuchi by the Sue in 1551. Althought the Shôni were to hold out for some years, both clans were internally weakened at this point, and even under Sue Harukata, the formerly mighty Ôuchi collapsed in struggles with their neighbours.
Iga: is still under official control at the hands of the Niki clan, even while the province is slipping out of their grasp.
Nagao: is the clan of Nagao Terutora, the soon to be Uesugi Kenshin, who holds no heriditary affiliation with the actual Uesugi, but is rather their vassal. Even so, he has by now eclipsed them in strenght.
Uesugi: of the Yamanouchi branch are hard pressed in their war against the Hôjô, with the Ogigayatsu branch having already fallen. In 1551, their last stronghold of Hirai will fall, and their daimyo will flee to his northern vassal Nagao and take refuge with them, for the price of adopting Terutora as his heir.
Murakami: are the inland pirates of Japan, situated along the southern coast of chûgoku and on its many islands. Even into the mid 1560's, these areas were badly splintered between many small and long forgotten clans, only to be fully unified following the Amako defeat at the hands of the Môri(1566), finally bringing a strong central power to the area.
Takeda: are currently busting their way into shinano province under Takeda Harunobu(later Shingen) at break-neck speed. Many local clans surrender and become vassals, while others, notably Murakami and Ogasawara, put up fierce resistance. Already by 1552, all notable opposition within shinano would've be swept aside, and total subjegation would be checked until 1564 only through the intervention by Uesugi Kenshin.
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