At El Kurru "some 120 meters to the north-west of pyramids K.51-K.55 four rows of graves were found which contained horse burials. The rows contained four, eight, eight and four graves respectively.... The tombs had all been robbed, but enough remained to determined that the horses were all buried in an upright position. The horses were buried with all their trappings" (Wiki)

"Almost one hundred pits containing the skeletons of horses and terracotta grooms constituted the emperor's stables. Even hay was provided." See "Stable Pits" under
See www.travelchinaguide.com

Horses were buried with the rulers as grave goods (AB ev)

"There are six Viking-Age cemeteries surrounding Birka, (...) one (...) contained the remains of a Viking woman buried with weapons and two horses." (Viking Age Ring Fortresses Nomination file, p. 203)

"Note that the bone matter found during excavation bears witness to the horse sacrifices which accompagnied (sic) the funeral rites." (AB)

The Longobards also had a practice to bury horses with their dead warriors. One example is on display at the Archaeological Museum of Cividale.
See www.italialangobardorum.it

"men and horses were buried alive along with the dead" (Visit Korea on Daeseong-dong)
See english.visitkorea.or.kr

"There are both human burials and remains of horses (assumed to be sacrificial offerings) at the khirgisüürs" (AB ev)