| Baron of Teffé | |
| Birth Date: | 9 May 1837 |
| Birth Place: | Itaguaí, Empire of Brazil |
| Death Place: | Petrópolis, Rio de Janeiro, Brazil |
| Children: | Nair de Teffé |
| Allegiance: | |
| Branch: | |
| Battles: | Paraguayan War |
| Module: | Coat of Arms of the Baron of Teffé |
Antônio Luis von Hoonholtz, Baron of Teffé (9 May 1837 – 6 February 1931), was a Brazilian admiral, politician, explorer and geographer.
His father was, a Prussian captain who emigrated to Brazil in 1824.
He was enrolled at the Naval School on 25 January 1852 and became a midshipman in 1854. In December 1858, he was promoted to second lieutenant and professor of the 4th year course at the Naval School. He was a precursor in hydrography and gave his first course in this subject at the Marine Academy of Rio de Janeiro in 1858. He then published the first treatise on hydrography in Portuguese.
During the Paraguayan War, commanding the gunboat ,[1] he was one of the heroes of the bombardment of Corrientes, occupied by the defenders of Paraguay. Then, on 11 June 1865, he won the officer's medal of the Imperial Order of the Southern Cross for his actions in the naval battle of the Riachuelo. On 13 and 14 July 1865, in new battles, he managed to set fire to the Paraguayan steamer , which had run aground. On 28 November 1865, he chased the Paraguayan steamer Pira-Guirá, forced it to run aground and seized it.
He then explored the coasts of Brazil in the vicinity of Santa Catarina Island.[2]
In 1871, he was entrusted with the delimitation of the borders between Brazil and Peru: leaving with his colleagues from Rio de Janeiro in October 1871, he travelled up the Amazon to beyond the Pongo de Manseriche, up the Huallaga river to the rapids in the foothills of the Andes, the Rio Negro and the Japurá River to the cataracts, then the Apaporis, the Madeira, the Purus, the Jutaí, the Putumayo and part of the Juruá rivers.
On 17 January 1874, the group entered the course of the Javary River. On 15 March 1874, they found the source and set the boundary marker between Peru and Brazil. He was the only Brazilian to return from this expedition in July 1874. Even his brother Carlos von Hoonholtz who accompanied him died of beriberi. This expedition earned him the title of Baron of Teffé.[3]
Promoted to rear-admiral, he led the Brazilian mission that observed the transit of Venus in front of the sun at Saint Thomas in the Caribbean Sea and at Punta Arenas in Patagonia in 1882.[4] He founded the first geographical society in Rio and organised the hydrographic service of his country.[5]
He was also Brazil's minister plenipotentiary in Belgium, Italy and Austria and was elected senator for the state of Amazonas.
He married Maria Luiza Dodsworth on 28 March 1868. From this marriage 4 children were born:
The Brazilian research ship Barão de Teffé was named after him.