Some time later, having learned German, he accompanied the baron to Regensburg, where he had the offer of a post in the family of Maximilian Karl, 6th Prince of Thurn and Taxis.
Boner became a lifelong friend of the prince, mixed in society, and spent twenty years in the family household at Regensburg.
[1] He visited William Wordsworth at Grasmere in 1844;[2] and in 1845 he made the acquaintance of Mary Russell Mitford, with whom he carried on a literary correspondence for ten years.
In 1867 Boner went to Salzburg to be present at the meeting of Napoleon III and Franz Joseph I of Austria, and wrote a description of the scene.
His translations from the German included Hans Christian Andersen's A Danish Story Book (1846), illustrated by Count Franz Pocci, and The Dream of Little Tuck (1848).