Simon Ives was a British composer of the 17th century.
The gillflower (gillyflower, gilliflower) may have been a carnation... or something else. Whatever it is, it must have a delicate fragrance, like this tune.
Adaptation for low 4th uke in TabEdit format.
You can always listen to the MIDI tunes by downloading the free software version of TablEdit (link in the right column).
The picture is the last ukulele I built, finished this very day!