It is not known where and when Anne was born, some reasons suggest that she was born at the end of 1440 or 1441. She was the eldest daughter of
Count John IV of Nassau-Siegen and his wife Lady
Mary of Looz-Heinsberg. . Anne married on 28 October 1467), who had succeeded his brother Duke
Bernard II in 1464. Anne already became a
widow in January 1471. Her son
Henry succeeded his father. As Henry was still a
minor, he was under the
custody and
regency of his paternal grandfather Duke
Frederick II the Pious, who had been in a
monastery since 1457. Anne had her dower rebuild between 1471 and 1473. Anne remarried on 24 January 1474). Philip had previously married on 24 February 1422 to Countess Anne of Württemberg (). Finally there was a daughter,
Anne, who was married to
Landgrave Henry III the Rich of Hesse-Marburg. Anne's second marriage was arranged by Anne's parents with the cooperation of the
estates of the realm of the
County of Katzenelnbogen. If a son had been born from the marriage between the 72 years old Philip and the 32 years old Anne, the later seizure of the County of Katzenelnbogen by the
Landgraviate of Hesse, which had its legal basis in the marriage of Philip's daughter Anne to Henry III of Hesse-Marburg, could have been avoided. This would have been entirely in the interest of the Counts of Nassau. The
marriage contract stipulated that Anne should receive an annual income of 1600
guilders in
interest and
in kind as a dower. Philip assigned
Burgschwalbach to his bride as her dower residence, together with the associated lordship and all rights of use; income derived from these lordship rights, for example from court
fines and other
fees, was not to be deducted from her other income. As a
morning gift, Philip obligated himself to allocate her 200 guilders annually, which Anne was allowed to use as she saw fit after his death, for example for the salvation of her soul. In return, Anne was to bring an annual
dowry of 400 guilders into the marriage. This dowry consisted of the income from her dower in the
Duchy of Brunswick-Lüneburg, the District of Lüchow, which she
leased for a sum of 666 guilders annually. For the first time, a firm will on the part of Anne becomes perceptible: as her father-in-law Duke Frederick the Pious and his councillors objected to the lessee she had chosen because they were at feud with him, Anne did not bow to the duke's wishes, but prevailed with regard to the lease agreement. When she left
Celle and the Duchy of Brunswick-Lüneburg at the end of 1473, Anne left her five-year-old son in the care of her father-in-law and sister-in-law
Margaret as the only female relative. This was customary and even legally binding for the children of a princely widow from her first marriage. After all, Henry was the sole
heir to the duchy. What feelings moved Anne in this is unknown, and how the young duke experienced the departure of his mother, is also unknown. After her regency ended in 1486, Anne lived in her town house in Celle, and for a time also in her dower Lüchow Castle, but she also kept in touch with her old homeland and often stayed in
Dillenburg or at the
spa in
Bad Ems. An account from 1487 shows that on 13 July she was in Siegen, together with her brother John, to supervise the progress of the building activities of the
Franciscan monastery he had founded there. Anne died in Celle and was buried there. ==Issue==