I te tau 1805 ka noho ia hei Kaiwhakaako mo te Hauora i Kiel (i te wa i Denmark me tetahi waahanga o te Duchy o Holstein) me te taitara Kaitohutohu o te Ture, a, i muri mai ko te Kaitohutohu o te Kawanatanga. He tau uaua ēnei mō Denmark, nā te mea i tū ki te taha o Wīwī i roto i ngā Pakanga o Napoleon.
ki Ingarangi (me ōna hoa) hei tiaki i tōna rangatiratanga moana. He raru te moni, a, i whakamahia e Wiedemann ana ake rauemi ki te whakatu i te whare haumanu mo te hunga whanau i whakaarohia hei tetahi o ana mahi hei kaiwhakaako.