[2] He won the Grand Prix de Rome for architecture in 1851 on the subject of "a hospice in the Alps".

[4] He drew reconstructions of the Appian Way, a military road built in 312 BC between Rome and Capua, drawing on the work of the archaeologist Luigi Canina and other sources.

[5] Since few remains of the buildings have been preserved, he was forced to draw on his imagination in depicting "an idea of the sumptuous and monumental characteristics that the road must have had.

[8] In January 1858 he was appointed architect for the Château de Pau, where he replaced Louis-Auguste Couvrechef, and for the summer residence of Villa Eugénie in Biarritz.

[1] Ancelet was responsible for reconstruction of the Empress's Castillo de Arteaga near Bilbao in the province of Biscay in Spain, which Couvrechef had started.

[13] In 1866, at the request of the Emperor Napoleon III, he began design and construction of a new theater for the Château de Compiègne.

[1] In 1892 he was elected a member of the Institute after the death of Antoine-Nicolas Bailly, charged with teaching "trois arts" at the École des Beaux-Arts.