With the Peace of Lunéville in 1801, the German areas on the left bank of the Rhine were incorporated into the French Republic.

In 1803, he was compensated for his losses and received Altenwied and Neuerburg, a valuable addition to the Westerwald ancestral lands.

In 1806, the right-hand part of the Runkel domain went to the Grand Duchy of Berg, which Napoleon had established as a satellite state of the French Empire.

In 1802 it was still said of his widowed mother, Princess Charlotte, née von Sayn-Wittgenstein-Sayn (14 July 1741 – 5 June 1803): "lives in Dierdorf with her son".

[6] or finally Carl Ludwig Friedrich Alexander, Prince of Wied, Count of Isenburg, Lord of Runkel and Neuerburg, Hereditary Marshal of the Duchy of Luxembourg and the County of Chiny, Grand Cross of the Polish White Eagle and the Royal Belgian Order of the Lion and the Order of St. John, Honorary Commander.