Location in the HRD of [ST92] 4-13 based on Schild & Testor (1992, left), with the current observations (right) are shown in red. The positions of confirmed LBVs from the literature in the galaxy (black circles), LMC (blue circles), and the SMC (orange circle; including AzV 261, discussed in Sect. 5.1) are also shown. Magenta circles marks the position of known LBVs in M31 and M33 (from Humphreys et al. 2017a). The dashed green lines are the stellar tracks from Brott et al. (2011) with the corresponding initial stellar mass indicated, and the solid line is the zero-age main sequence isochrone for LMC metallicity.