Eh. not really Dutch ..... but part of the 80 years war anyway
These are flags from the regiment locally raised by kolonel Olivier van den Tympel, lord of Korbeek-Lo in the late 1570's. He came
from a noble family in the Duchy of Brabant. It served as the garrison of Brussels until about 1585 when it fell to Allesandro Farnese Duke of Parma. (so Belgian ?

)
The Gortter manuscript which has the original drawings is still in the Albertina library in Brussels. It shows these flags, flags from
the Antwerp city militia, cavalry (guard of William of Orange),(lancers, mounted arquebusiers) German soldiers raised by Don Juan of Austria, French cavalry from the Duke of Alençon (Elisabeth I suitor) and Spanish cavalry (with flags !)
Carl