Sorry for the late reply, I was away for the weekend. To get started, here are some earlier threads about the famous and/or influential armourers of Europe. These deal with the social position of armourers, the scale of their operations and the cities they lived in:

• The Innovators of Armouring
• Commissioning and Customizing Armour
• Why were Milanese armourers so successful?
• The Armour Industry of Milan, contd.
• Two Podcast Episodes About the armour industry
• Could you sue and armourer for malpractice?