Franz Pforr was a Romantic painter 1788-1812 He was born in Frankfurt Ammain in Germany and worked in Rom Wien
Franz Pforr was a founding member of the Nazarenes. Inititally from Germany, he moved to Rome with the group in 1810. His paintings focused on fantastical subjects with a medieval setting and were characterized by their bright colors and detail. Pforr perished from tuberculosis two years after he arrived in Rome.
more of his works here http://www.artrenewal.org/pages/artist.phpartistid=4819
and here too http://wwar.com/masters/p/pforr-franz.html