The authors report the discovery of incommensurate magnetic order in non-superconducting single crystals PrBa{sub 2}Cu{sub 3}O{sub 6.92}. Resonant x-ray magnetic scattering at the Pr L{sub II} and L{sub III} edges and high resolution neutron diffraction were used to characterize the magnetic order on the different magnetic sublattices. The data reveal that the Pr sublattice orders at a temperature of 19 K in an incommensurate structure with ordering wavevector (0.5 {+-} {delta}, 0.5, 0) or (0.5, 0.5 {+-} {delta}, p), {delta} {approx} 0.006--0.008. A spin reorientation in the Pr sublattice to a commensurate antiferromagnetic structures with ordering wavevector (0.5, 0.5, 0.5) takes place at a temperature close to 9 K.
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