sentences:  If the theory were to be correct, Henry would have been the commander of the Polish contingent in the Second Crusade in 1147.This possible incursion in the Crusades was short (if really occur), because in 1149, together with his older brother Bolesław IV, he took part in a military expedition in Kiev to support the Grand Prince Iziaslav II.The first and maybe the most famous of all Sandomierz's dukes, Henry certainly ventured to the Holy Land in 1153-1154 (a number of Polish annals reported it under the year 1154 as did Jan Długosz in his Annals) and took part in the Second Crusade under the command of King Baldwin III of Jerusalem.