Guillaume II de Mont-Saint-Jean

From Medlands:

GUILLAUME [III] de Mont-Saint-Jean (-[1256]). His parentage is confirmed by the marriage contract between “Guillelmus dominus Montis Sancti Johannis...Guillelmo filio meo primogenito” and “dominum meum Hugonem ducem Burgundiæ...Margaretam filiam suam” dated [4] Jun 1239[1390]. Seigneur de Mont-Saint-Jean. “Guillelmus Montis S. Iohannis dominus de Salmasia” donated “CC. libris pasturas meas de Fusse” to Pontigny abbey, in payment of a debt of “bonæ memoriæ Willelmi quondam domini Montis S. Johannis patris mei”, with the consent of “fratris mei Stephani”, by charter dated 1255[1391].

m (1239 after 4 Jun) as her first husband, MARGUERITE de Bourgogne, daughter of HUGUES IV Duke of Burgundy & his first wife Yolande de Dreux (-27 Aug 1277). The marriage contract between “Guillelmus dominus Montis Sancti Johannis...Guillelmo filio meo primogenito” and “dominum meum Hugonem ducem Burgundiæ...Margaretam filiam suam” is dated [4] Jun 1239[1392]. Dame de Molinot, by grant of her father as dowry, in return for her first husband transferring his rights to Vergy to her father. She married secondly (1258) as his second wife, Guy [VI] Vicomte de Limoges. The Chronicon Gaufredi Vosiensis names "Margarita filia Ducis Burgundiæ" as wife of "Guidonem Probem"[1393]. An anonymous Chronicon of Saint-Marcial records that "Margarita filia ducis Burgundie et vicecomitissa Lemovicensis" subjugated the castle of Limoges in 1274[1394]. Her subjects at Molinot rebelled against her in 1265, her father helping her to crush the revolt[1395]. A fragment written by Bernard Guidonis records that "domina Margarita vicecomitissa Lemovicensis, filia ducis Burgundiæ, relicta...domini Guidonis vicecomitis Lemovicensis" founded the monastery "locum Sancti Pardulphi in Petragoricensi diœcesi, in confinio Lemovicensi"[1396]. An anonymous Chronicon of Saint-Marcial records the death "mense Augusti die Veneris pos festum beati Bartholomei" of "Margarita vicecomitissa Lemovicensis"[1397]. Guillaume & his first wife had one child

NB: Medlands omits to mention who the one child of first wife was and although implies at least one more wife no more are given.

This profile has several children of first wife - is this an error?