  We report a ground state with strongly coupled magnetic and charge density
wave orders mediated via orbital ordering in the layered compound \tbt. In
addition to the commensurate antiferromagnetic (AFM) and charge density wave
(CDW) orders, new magnetic peaks are observed whose propagation vector equals
the sum of the AFM and CDW propagation vectors, revealing an intricate and
highly entwined relationship. This is especially interesting given that the
magnetic and charge orders lie in different layers of the crystal structure
where the highly localized magnetic moments of the Tb$^{3+}$ ions are netted in
the Tb-Te stacks, while the charge order is formed by the conduction electrons
of the adjacent Te-Te layers. Our results, based on neutron diffraction and
resonant x-ray scattering reveal that the charge and magnetic subsystems
mutually influence each other via the orbital ordering of Tb$^{3+}$ ions.
