From an old thread on Knighthood that was lost in the forum yet preserved in the WIKI.
Posted By Caspian at 6:23 PM - Wed May 04 2016
Knight is a title. It can be bestowed by Dukes as well as Kings.
As with many of their duties, Dukes and Kings will also be able to delegate this ability to others. I believe [an old post in Discord mentioned] that the very act of delegation may be able to bestow many different types of titles via an external contract. The laws of the land might simply state that delegation of certain rights is called one type of entitlement and delegations of other rights another type of entitlement.
A Duke/King could delegate any of their military and legal powers to a High Sheriff of the Duchy, Lord Marshals/Generals, County Sheriffs, Lord Lieutenants [historically created to strip military power from Sherrifs], or any Aristocrats and members of the Gentry who have military contracts with the Duke. Those with delegated power might subsequently have some limited ability to delegate some of that power to those below them. Border county Sheriffs/Lieutenants will most likely have at least some limited ability to knight others as field commissions since they will probably be the leading military commander on a field of battle.