Wiktionary
n. An attendant who supports the train of a dignitary
Usage examples of "train-bearer".
This hosier, who had just held Monsieur the Cardinal at defiance, was their equal—a soothing reflection to poor devils accustomed to pay obedience and respect to the servants of the very sergeants of the bailiff of the Abbot of Sainte-Geneviève, the train-bearer of the Cardinal.
I soon discovered my mistake, and found him to be train-bearer and organ-blower to a whole procession of people.
With Guilford, dazzlingly robed in white, gold and silver, at her side, paying her 'much attention' and bowing low to her each time she addressed him, she landed at the court gate, followed by her mother, who was acting as her train-bearer, and surrounded by six noblemen :arrying a canopy of estate above her head.