Louis August CLEEMANN (LASSENCE) 
- Born: 1777, Dresden
- Marriage (1): Thérèse LASSENCE  on 28 Nov 1802 in Lisbon Portugal
- Died: 17 Jan 1847, Heidelberg Germany aged 70
Louis Auguste, was born in Dresden, Germany, under the name Cleemann. He was from a very respectable German Lutheran family, most likely originating from eastern Prussia or Poland.
The Lassence family is from Liège, in Belgium, also respectable people.
Louis Auguste Cleemann and Thérèse Lassence met in Lisbon, where she was born after her father left Liège to settle there and became a successful business man. Louis Auguste is also supposed to have come to Lisbon for business.
He married Thérèse in 1802. By the end of 1807, as they already had two daughters and she was pregnant with Auguste, they were forced to move to Paris since the continental blockade made it very difficult to trade from Lisbon. Louis Auguste saved his business. Auguste was born in Paris in March 1808, soon after they had arrived.
In 1838 Auguste was sentenced for several years in jail for having sold the shares of a mine company, which actually had no substance. He left France a few hours before the sentence was pronounced. The scandal, later totally forgotten in the family, was huge at that time.
Louis Auguste and Thérèse his parents had to leave France too as it had become impossible to bear the name of Cleemann there. They moved to Mannheim 1838/39. They had all changed their names to Lassence.
Justinian Alston and family had moved to Mannheim c1839 and lived in a street opposite the Cleeman-Lassence's
They met and in order to explain why both parents of Auguste were "Lassence", they pretended to be cousins.
Ref: Louis de Lassence 2019
1. Louis Auguste Cleemann Lassence: Arrival in Mannheim Germany, 6 May 1839, Mannheim Germany.
Questionnaire completed by Cleemann-Lassence on their arrival at Mannheim on 6 May 1839
THE DIRECTION OF THE POLICE OF MANNHEIM
Invites each foreigner wanting to remain here for some time, to write with his own hand on this leaf:
1) His surname and baptism name
Ludwig Auguste Cleemann Lassence
Quality or profession;
Rentier (person of independant means)
Place of birth
2) Family name and baptism, and birthplace of his parents, who go with him;
Madam Therese Lassence Lißabon (Lisbon) Mr Auguste € Lassence Paris.
3) Household and baptismal name of the servants,
4) If he will live on his rents, or by what occupation he can earn living;
5) Name of his landlord; letter and number at the house where he lives;
. . . . . Lt O7. N:5 (within block O7, number 5)
6) The day of his arrival;
6 May 1839
7) The probable duration of his stay in that city;
Unknown (unbekannt in German)
NB. To this sheet must be added the passport or similar documents of the foreigner and his family, as well as those of all his servants, brought here.
Louis de Lassence points out Lißabon is a German-speaking hand and this writing is identical to the signature of Louis Auguste on the marriage contract of his daughter Marianne. It seems to indicate Cleemann Lassence as his last name.
2. Louis Auguste Cleemann Lassence Family: Home in Mannheim Germany, 6 May 1839, Mannheim Germany.
The Cleemann-Lassence residence in 1839 was O7.
On a map of 1813, there are gardens at the location of O7: (see map - still today, the old town of Mannheim is divided into blocks designated by one letter and one number).
They (O7 & N6) were bombed in the night of 5 to 6 September 1943.
The center of Mannheim was rebuilt keeping this plan, but in an unattractive architecture.
Source: Landesarchiv Baden-Wurttemberg
Louis married Thérèse LASSENCE  [MRIN: 11475], daughter of Louis LASSENCE  and Birgit SHEE , on 28 Nov 1802 in Lisbon Portugal. (Thérèse LASSENCE  was born in 1778 in Lisbon Portugal and died circa 1853 in Mannheim Germany.)