[[File:The death of Leszek the White.jpg|thumb|left|300px|Lestek's death as painted by Jan Matejko in 1880]]
In 1227, Lestek called a summit of all Polish dukes at Gonsava in Paluki, the border region between Masovia, Greater Poland and Pomerania. We don't know exactly what points were on the agenda, but it most likely had something to do with ending the feud between Spitter and Spindleshanks over Greater Poland and bringing Swantopolk to heel, as he was trying to free Pomerania from Polish rule. Lestek from Cracow, Conrad from Masovia, Henry the Bearded from Silesia, Vladislav Spindleshanks from Greater Poland, as well as many bishops and great lords all came to Gonsava. Only two key participants were missing: Vladislav Spitter and Swantopolk. After almost two weeks, it was decided that there was no point waiting any longer and most people started heading back home. Lestek and Henry lingered on, though. Did they want to talk some things over in private or had they drunk so hard that they were unfit for a journey home (Henry had the same reputation as Lestek in this regard)? We don't know. But it was then, in the early morning of 24 November, when Spitter and Swantopolk finally showed up – along with their henchmen. Henry, whom they caught in his bed, was wounded, but it was his loyal knight, Peregrin of Weissenburg, who took the fatal blow. Meanwhile, Lestek was attacked while having a bath. Somehow this allegedly obese, hung-over forty-something was able to escape the assailants, run naked from the bathhouse to the stable, jump on a horse and ride off into a snow-covered forest (back then, the climate was colder and Poland was more forested). Unfortunately, the assassins caught up with him 2 kilometres away.
A year after Lestek's untimely death, but possibly on still on his orders, a Dominican friar of House Odrovonsh set out from Cracow on a mission to Kiev. Better known as [[Saint Hyacinth of Pierogi|Saint Hyacinth]], he is believed to be the one who brought the first recipe for pierogi on his way back to Poland.