We describe the orbits of the general linear group GL(n, T ) over a skew field T acting by simultaneous conjugation on pairs of 1-tori, i.e., subgroups conjugate to diag(T ∗, 1, . . . , 1), and identify the corresponding spans. We also provide some applications of these results to the description of intermediate subgroups and generation. These results were partly superseded by A. Cohen, H. Cuyp...