A wider array of documents referring to Heidesheim only comes to light about 1150. The Altmünster Abbey at Mainz then had at its disposal extensive landholdings and half the tithes. Whether these stemmed from the Rhine Counts ("Rheingrafen"), as one always reads, has yet to be confirmed. Besides this, in 1145, the first holding in Walsheim (a vanished village near Heidenfahrt) passed to Eberbach Abbey, laying the groundwork for the "Sandhof" (see Culture and sightseeing: Buildings below). Eventually, in 1158, the Lords of Winternheim were mentioned, who later named themselves after the castle, Burg Windeck, as the Lords of Winterau. Besides these three parties, who dominate the historical records, other Mainz monastic foundations and resident families held lands and rights here.