The University Library Lund in Sweden keeps the most extensive source for horn music from the first half of the 18th century. The music is a handwritten collection of the Academic chapel. Many of the composers therein had somehow connections to the court in Dresden. It is possible that the copier was a hornist who visited Dresden.
This collection Wenster contains 18 concertos for horn - and not 17 how it is always said.
The original numbering of the collection:
No.1 Schulz Concerto ex D sharp for horn, flauto traverso, violin and basso -> (ROM 018)
No.2 Hoffmann Concerto ex D sharp for horn, 2 oboes and strings -> (ROM 013)
No.3 Quantz (C.G. Fischer?) Concerto ex D sharp for horn and strings
No.4 Anonym Concerto ex D sharp for horn, 2 oboes and basso -> (ROM 019)
No.5 Förster Concerto ex D sharp for horn and strings -> (ROM 341)
No.6 Anonym Concerto for horn, oboe d`amore and basso ->(ROM 020)
No.7 Graun Concerto for horn, oboe d`amore and basso -> (ROM 181)
No.8 Graun Trio for horn, violin and basso continuo -> (ROM 182)
No.9 Quantz Concerto for horn, oboe and strings -> (ROM 021)
No.14 Röllig Concerto ex D sharp for horn and strings -> (ROM 022)
No.15 Röllig Concerto ex D for horn and strings -> (ROM 023)
No.16 Graun Concerto ex D for horn and strings -> (ROM 024)
No.17a Reinhardt Concerto ex D sharp for horn and strings -> (ROM 025)
No.17b Gehra Concerto ex D for horn and strings -> (ROM 026)
No. 15 Johann George Roellig (1710 - 1790)
Concerto ex D major for corno concertato, 2 violins, viola and basso
In the manuscript only Roellig is written down. RISM notes Johann George Roellig as the composer. Because the composer was probably from or near Dresden the following concerto is certainly composed by Johann George Roellig. He was born in Berggiesshuebel 1710, attended the school "Kreuzschule" in Dresden and at the expense of prince Bruehl was taught by Zelenka and Reinhold. He studied theology in Leipzig. There he was heard by prince Johann August of Anhalt-Zerbst on the organ and with the cello. The prince took Roellig along to Zerbst where he became the organist and chamber musician of the court. He became late vice-master of the chapel, after the death of Fasch 1758 real chapel-master in Zerbst.
However, another composer comes perhaps also in question:
Christian August Roellig was born in Königsbrück near Dresden. He became court music director in 1730 and he still was called 1741 in this position.