"Peter von Biron (15 February 1724 – 13 January 1800) was the last Duke of Courland and Semigallia, from 1769 to 1795." - (en.wikipedia.org 05.11.2019)
en
"Peter von Biron (15 February 1724 – 13 January 1800) was the last Duke of Courland and Semigallia, from 1769 to 1795." - (en.wikipedia.org 05.11.2019)
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