Armgard was born at Bad Driburg, Kingdom of Prussia (now in North Rhine-Westphalia, Germany),as the fourth child and fourth daughter of Baron Aschwin of Sierstorpff-Cramm (1846–1909), and his wife, Baroness Hedwig of Sierstorpff-Driburg (1848–1900).

Armgard married on 24 October 1905 at Hanover to Count Bodo von Oeynhausen (1881–1909), an officer in the 8th Hussarsin Paderborn, son of Count Erich von Oeynhausen(1849-1898) and his wife, Therese von Lenthe (1846-1917). They divorced in 1908 and had no children.

Armgard married secondly, after the death of her ex-husband, on 4 March 1909 at Oelber, Brunswick to Prince Bernhard of Lippe(1872–1934), a younger son of Ernest II, Count of Lippe-Biesterfeld, regent (1897–1904) of the Principality of Lippe. This was deemed morganatic, and on 8 February 1909, a month before the wedding, she was created Countess of Biesterfeld (German: Gräfin von Biesterfeld) .On 24 February 1916 she was made Princess of Lippe-Biesterfeld(German: Prinzessin zur Lippe-Biesterfeld) with the style Serene Highnessby her brother-in-law, Leopold IV, Prince of Lippe, and this title was extended to her two sons in order to produce a new branch of the Lippe family.

After the death of her husband in 1934, Armgard moved into Reckenwalde castle with her sons and managed an estate in Wojnowo, Lubusz Voivodeship, Province of Brandenburg (now Wojnowo, Poland), together with her new partner Alexis Pantchoulidzew, member of an exiled Russian nobility.Alexis accompanied Armgard to the wedding of Bernhard to Princess Juliana.

They in early 1952 to a House Warmelo at Diepenheim. Alexis went on to be the Netherlands' sole representative at the 1956 Summer Olympics, competing in dressage. He died at their home in 1968.

Armgard was a convert to Roman Catholicism like her granddaughter Princess Irene, but decided against attending Irene's controversial wedding to Carlos Hugo, Duke of Parma, which neither the Dutch royal family nor any Dutch diplomatic representative attended. The family nevertheless gathered at Armgard's home for the television coverage of the wedding.

Armgard died on 27 April 1971 in House Warmelo in Diepenheim at the age of 87.

***Family Links***

Son:

Bernhard Count zur Lippe-Biesterfeld (1911-2004), husband of Juliana, Queen of the Netherlands (1909-2004)