Equerry
/ɪˈkweri/
Definition 1 of 1
Pro Tip 1/3Royal Connection
The word 'equerry' is often associated with royal services and ceremonies. 
During the procession, the queen's equerry walked beside the carriage.
Pro Tip 2/3Modern Role
'Equerry' now refers more to a personal aide than someone who handles horses. 
The prince's equerry assisted him with his daily schedule and engagements.
Pro Tip 3/3Military Background
Equerries often have a military background; it's a prestigious position. 
Her equerry, a former army captain, was always by her side during events.