To my uneducated eye they appear to be most suitable for the 3rd Crusade, and include both Crusaders and Arabs.
They are made of resin, which does put some people off! They are, however, lovely looking figures...
Looking for 28mm historical miniature figures? This blog is a database of manufacturers showing who makes what. I am also adding photos showing figures from different makers side by side. The 'Directory' tab has a list of manufacturers showing what ranges they make and a link to their website. The other tabs list what figures are available for that period.