RTK book mentions that people or Mangs from the south have blue eyes. zhuge liang met them.
from chapter 88 and line 87-88:
"They were brought in for Zhuge Liang's inspection. They had blue eyes and swarthy faces, auburn hair and purple beards. They wore earrings, their hair was fuzzy, and they went barefoot. They were tall and powerful.
Zhuge Liang made them sit down, and bade his generals press them to drink and treat them well and compliment them."
isnt sun quan one of mangs?