Ok, after some research I found the following:
Armies of the dark ages by Ian Heath includes a ton of reference material for the dark ages including an image of a frisian soldier during the frankish wars.I also found that someone else had asked this question elsewhere and someone provided them with a detailed answer![1] Only the most wealthy Frisian warriors could afford full military equipment. The Lex Ribuaria, from the era 630 – 750 AD, which applied to Cologne / Koln region of Germany (fairly close to Frisia), shows us that: -
• A suit of chain mail cost the equivalent of 12 cows.
• A sword + scabbard cost the equivalent of 7 cows.
• A helmet cost the equivalent of 6 cows.
• A set of greaves cost the equivalent of 6 cows.
• A shield + a spear cost the equivalent of 2 cows.
• A horse cost the equivalent of 7 cows.
So, a fully equipped warrior, mounted on a horse, would have needed 40 cows to pay for all his war gear. Only the very wealthiest warriors could have afforded so much.
[2] The average grunt would have had to make do with just 2 cows worth of military equipment = a shield and a spear. He would have had no body or leg armour, no helmet, no sword, no horse. He might, however, have been able to afford a stabbing knife (blade length 15 cm or less).
See
http://www.keesn.nl/price/en1_intro.htm as the source for the above notes.
[3] Like other Germanic tribes of the period, Frisians fought mainly on foot, using melee weapons. The average infantryman usually lacked armour of any kind (possibly wearing a leather jerkin). The basic warrior's equipment was a six to eight foot (2 to 2.5 meters) long spear and a round shield three foot (1 meter) in diameter. Basic clothing: wool trousers or leggings; shoes; belted wool tunic; wool cloak. Frisian warbands might include a few skirmishers using missile weapons: either a short bow or a sling. Skirmishers carried neither shield nor spear, though they would often have a war knife.
The miniatures shown at this site
http://www.umiacs.umd.edu/~kuijt/dba74- ... 4-75a.html offer several illustrations of both average and elite warriors for your period.
[4] Do not be confused by the illustration in this Wikipedia site about the murder of Bonifacius. The missionary Boniface was murdered in Frisia in 754 AD, just a few years after your period. The illustration shows Boniface being attacked by Frisian warriors, all of whom are in full mail body armour and helmeted, one having also greaves; the same one is hacking at Boniface with a long sword. Unfortunately, the illustration is not from 754 AD, but from 975 AD. As was common practice with medieval illustrators, the artist portrayed weapons and equipment from his own time, not from the historic time period of the event. So the illustration gives no accurate notion of Frisian weapons and equipment for your time period.
http://en.wikipedia.org/wiki/File:Marte ... fatius.jpg
I hope that helps you!
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