The large swinging bell Gloriosa, cast in 1497 for Erfurt Cathedral by Gherardus de Wou, ranks as an outstanding masterpiece of Gothic bell-founding art. Its musical quality and formal aesthetics became an object of emulation for generations of succeeeding bell founders and there have been repeated attempts to discover the hidden deisgn of the bell's profile.An early drawing is based on measurements made in 1865 by Sorge and consistent or modified reproductions of it were subsequently published by several authors. Since 1985, a new admeasure of the bell's profile has been available. From these data a shape-fitting reconstruction was obtained by means of computer aided design (CAD) but following the traditional principles of bell design.With the aid of the finite element method (FEM) the frequencies of the partials of a bell can be calculated from its material and its profile. They make up the inner harmony as an important part of euphony, namely the purity of sound. Calculated values for the most important partials are given in terms of deviation from ideal harmonic intervals and are compared with acoustically ascertained values and modern standards. A further part of euphony, i.e. reverberation and sonority, is related to the bell metal, makingGloriosa highly resonant.As a piece of luck with a singular coincidence of perfect profile and excellent material.Gloriosa will remain the undefeatable prototype of western bells.