Berta di Clavesana

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3. BERTA di Clavesana (-after 1224). Her parentage and marriage are confirmed by the charter dated 9 Aug 1202 which records that Bonifazio Marchese di Monferrato promised "Guilelmo filio suo" to ratify the peace agreement with Alexandria and Asti and with "socero suo domino Bonefacio de Cravexana…"[1039]. Heiress of Mambarasco e Cortemiglia.

m (before 9 Aug 1202) as his second wife, GUGLIELMO di Monferrato, son of BONIFAZIO Marchese di Monferrato & his first wife Elena di Busca ([1180]-17 Sep 1225). He succeeded his father in 1207 as GUGLIELMO VI Marchese di Monferrato.

William VI, Marquess of Montferrat

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Marriages and children

During his infancy, William was betrothed to Sophie, daughter of Frederick I, Holy Roman Emperor. The marriage took place in 1187, when William was fourteen years old, and Sophie twenty-five; nevertheless, this union ended soon: Sophie died shortly after in that year.

On 9 August 1202 William married Berta, daughter of the Marquess Bonifacio di Clavesana, Count of Cortemiglia. They had at least three children:

Boniface II , Marquess of Montferrat (b. ca 1203).

Beatrice (b. ca 1210 - d. 1274), Lady of Saint-Bonnet in her own right. She married three times:

On 15 November 1219, Guigues VI of Viennois

In 1252, Guy II, Lord of Bauge

Pierre de la Roue

Alix (b. ca. 1215 - d. 1232), married in May 1229 Henry I of Lusignan, King of Cyprus.

Otto of Montferrat, (d. 1251), who became Bishop of Porto, and Cardinal in 1227, may have been a son of William VI; whether he was legitimate or not is uncertain.