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We investigated the nature of the massive star [OMN2000] LS1 and used theseresults to constrain the history of star formation within the host complex W51.A combination of near-IR spectroscopy and non-LTE model atmosphere analysis wasused to derive the physical properties of [OMN2000] LS1 and a combination oftheoretical evolutionary calculations and Monte Carlo simulations to applylimits on the star formation history of W51. The spectrum of [OMN2000] LS1 isconsistent with that of a P Cygni supergiant, but with a temperature of13.2-13.7kK and log(L/L_sun)<5.75, it is significantly cooler, less luminous,and massive than proposed by previous authors. The presence of such a starwithin W51 shows that star formation has been underway for at least 3Myr, whilethe formation of massive O stars is still on going. We find no evidence ofinternally triggered, sequential star formation within W51, and favour thesuggestion that star formation has proceeded at multiple indepedent siteswithin the GMC. [ABRIDGED]

The P Cygni supergiant [OMN2000] LS1 - implications for the star formation history of W51