HIDDEN MEANING behind birthday portrait of the Queen, 96, posing with two white horses
https://meaww.com/hidden-birthday-portrait-queen-horses
Depending on the culture, white horses symbolize purity, heroism or death.
https://www.reference.com/world-view/white-horse-symbolize-712c03a575a30559
Article says it depends on the culture.
https://www.kingjamesbibleonline.org/Revelation-6-8/
REVELATION 6:8
“And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.”