Ernst Philipp Thomann von Hagelstein is an artist whose historical record is quite obscure, leading to challenges in constructing a detailed biography. It is not uncommon for lesser-known artists from earlier centuries to have little information preserved about their lives, especially if their work did not gain widespread recognition or if they were not connected to significant artistic developments of their time.
Due to the lack of available information, it is difficult to give an accurate account of Thomann von Hagelstein's life and work. What can be surmised is that he may have been active during a period where many artists were part of larger movements, schools, or were influenced by prominent styles of their era. Without specific details about his birth, death, or the contributions he made to the world of art, any biography remains incomplete.
In the absence of concrete details, art historians would typically turn to the artist's surviving works if any exist, or to mentions in archives or inventories of art collections from the period in which he might have lived. Through such works and references, it may be possible to infer something about the artist's style, subjects, and the cultural context in which he operated.
Unfortunately, without further historical records or scholarly research that sheds light on Ernst Philipp Thomann von Hagelstein's life and oeuvre, we are unable to provide a substantive biography. He remains, as of now, an enigmatic figure whose contributions, if any, to the history of art await rediscovery and appreciation.