BYZANTINE SILVER CUP WITH NIELLO CHI-RHO. Ca. 1100 - 1200. A silver cup with a deep, rounded bowl that gently curves inward. The interior features a centrally placed Chi-Rho monogram enclosed within a circular border, rendered in niello. The symbol consists of the intersecting Greek letters chi (Χ) and rho (Ρ), flanked by the alpha (Α) and omega (Ω) on either side. The exterior of the bowl displays a subtly ribbed texture running vertically from the base to the rim. The cup stands on a cylindrical foot that slightly flares outward. Size: 150mm x 70mm; Weight: 395g Provenance: Private London collection; Ex. A. Moser collection, Switzerland, 1980s-2000s; formerly in an early 1980s Dutch collection. This item has been cleared against the Art Loss Register database and comes with a confirmation letter.