Responding to the demand of greater fortification, Welsh landlords strengthend palisade walls to construct Border Forts. This technology will increase the hit points of palisades and enables gates for the construction of proper forts.
Note that Wales does not require a policy decision to research this. This means a Welsh player can choose not to Normanize (which keeps stone walls disabled) and still build gates, making a fortress out of nothing but gates!
Available to: Wales
Researched at: University
Effect: Palisades +500 HP, enables Gates