Rhialto the Marvellous is a collection of one essay and three fantasy stories by American writer Jack Vance, first published in 1984 by Brandywyne Books, a special edition three months before the regular (below).

Rhialto and his associates journey towards the edge of the Universe to seek their erstwhile colleague Morreion, sent away in the distant past to locate the source of the valuable, magic-annulling IOUN stones.

Restrictions from The Dying Earth, that wizards can memorize only few spells by stringent study, which are forgotten again when used, appear to be missing from the Cugel and Rhialto cycles.

Thus, while the Blue Principles acts as a nonaggression pact and a defensive alliance, most of the time it serves as a social circle and gentleman's club.

The members spend most of their time enjoying fine food and drink, courting ladies of the nearby kingdoms, conversing, and squabbling with one another over magical relics, or playing pranks on one another.