Adding a new building using scripting

[julianus heraclius]

I want to make a foederati recruiting buildings for Imperium Julianorum mod, but only want them to become available from say 385AD.

What scripting is required and what do I put in the edb file as well.

Any help appreciated.

Thanks

[Aradan]

You just need a simple script that will place a "marker" building in every settlement, and you make that building as a prerequisite for your 'foederati' building. You can check how other mods (EB for example) do this kind of things, to get an idea.