Knights of the Rainbow
Flunkeys; so called from their gorgeous liveries.
“The servants who attended them contradicted the inferences to be
drawn from the garb of their masters; and, according to the custom of
the knights of the rainbow, gave many hints that they were not people
to serve any but men of first-rate consequence.” —
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894