death in 1361. John of Gaunt was later elevated to "Duke of Lancaster", founding the House of Lancaster cadet branch. Around 1349, a double marriage was solemnized in which John de Segrave married Blanche de Mowbray, the daughter of John de Mowbray, 3rd Baron Mowbray by his first wife, Aline de Brewes, daughter of William de Braose, 2nd Baron Braose; while John de Segrave's sister, Elizabeth de Segrave, married Blanche de Mowbray's brother, John de Mowbray, 4th Baron Mowbray. Pope Clement VI granted papal dispensations for the marriages at the request of Henry of Grosmont, in order to prevent 'disputes between the parents'. John de Segrave died around 1353, making Elizabeth de Segrave the 5th Baroness Segrave suo jure. Two years after the double marriage, and a year following Margaret's request for an annulment (1351), Edward III charged Margaret with having crossed the English Channel, in contravention of his prohibition. The inquisition, regarding this incident, shows that Margaret unlawfully crossed the Channel and met with a servant of her future husband, Sir Walter Manny, 1st Baron Manny, who broke his lantern with his foot so she could pass unnoticed, and acted as her guardian during her sojourn in France. This incident and the involvement of her future husband's retainer may indicate the real motivation for Margaret seeking an annulment. The annulment case was ultimately heard by the Pope's auditor, the Dean of St. Hilary's at Poitiers. However, Margaret's first husband died in 1353, before the annulment could be finalized. Shortly thereafter, and just before 30 May 1354, she married Walter Manny, 1st Baron Manny without the King's license. They were married for 18 years, and had three children before he died in London on 8 or 13 January 1372. On 29 September 1397, Margaret was created Duchess of Norfolk for life. She died 24 March 1399, and was buried in the choir of Grey Friars in the City of London. The executors of her will are reported to be John Sileby and Walter fitz Piers, who in 1399 were reported to be attempting to recover money due to her estate. Residence She was most likely born at Framlingham Castle in Suffolk, England while her father Thomas de Brotherton was the 1st Earl of Norfolk. The castle had been given to her father by her uncle, King Edward II before her birth and so it was her childhood home. She inherited