  We present here the first measurements of sulphur abundances in extragalactic
stars. We make use of high resolution spectra, obtained with UVES at the ESO
8.2 m Kueyen telescope, of three giants of the Globular Cluster Terzan 7, which
belongs to the Sagittarius dwarf galaxy. We measure the sulphur abundances
using the lines of S I multiplet 1. The S/Fe ratios for all three stars are
nearly solar, thus considerably lower than what is found in Galactic stars of
comparable iron content ([Fe/H] ~ -0.50). This finding is in keeping with the
abundances of other alpha-chain elements in this cluster and in Sagittarius and
other dSphs in general. These low alpha-chain elements to iron ratios suggest
that Sagittarius and its Globular Clusters have experienced a low or bursting
star-formation rate. Our sulphur abundances imply <\log (S/O)> = -1.61 which is
comparable to what is found in many H II regions of similar oxygen content, and
is slightly lower than the solar value (log (S/O)sun = -1.51). These are also
the first measurements of sulphur abundances in a Globular Cluster, thus a
direct comparison of Terzan 7 and Galactic Globular Clusters is not possible
yet. However our analysis suggests that the lines of S I multiplet 1 should be
measurable for other Globular Clusters at least down to a metallicity ~ -1.5.
