On the death of her father in 1948, she inherited the Portuguese countship of Mértola, while she and her sister, Lady Wendy Lycett became co-heirs to the baronies of Fauconberg and Conyers, which went into abeyance.
On 15 November 1952, Lady Diana married Robert Miller (d. 1990, in an automobile accident in Harare) and they had two daughters - co-heiresses to the baronies: When pregnant with Marcia, Lady Diana put her baby for adoption (when separated from her husband, Robert Miller, whom she reconciled to later), which was agreed and accepted by Moira Lycett and her husband Michael, who changed her name to Anthea.
In August 1958 Moira and Anthea were flying to London in a Central African Airways' Vickers Viscount aircraft, which crashed near Benghazi.
Lady Diana's family sought to reclaim the child to the exclusion of the adopted father, Michael Lycett, who refused.
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