This chapter explores the creative and personal fellowship between and among Robert and Clara Schumann and Joseph and Amalie Joachim, a circle regarded in their time as a ‘priesthood of art’. United by ideals that fused intellect, probity, and aesthetics, they helped redefine the nineteenth-century virtuoso as an interpretive artist guided by spiritual conviction rather than mere technical display. Robert Schumann’s early recognition of Joseph fostered an intense relationship of mentorship and inspiration, shaping Robert’s late compositional output and supporting Joseph’s own artistic growth. For Clara, Joseph became her most frequent concert partner and a principal adviser on professional and personal matters. Amalie also collaborated with Clara, appearing with her as valued colleague and equal. Together, the Schumanns played a decisive role in steering Joseph away from the New German School, while he in turn gave steadfast support to the Schumann family during and after Robert’s illness and decline.