Tonlieux have been a topic of discussion lately in libertarian circles. A tonlieu is a fee paid to a sovereign in exchange for safe passage or residence in his domains or for access to the markets thereof, and for the protection of his laws. Tonlieux were common in Medieval Europe. Domains of all sorts – cities, counties and abbeys, and of course duchies, principalities, and kingdoms – charged a fee to travellers who traversed or stayed in their lands or transacted in their markets (or used their bridges, ferries, or roads), no matter how short or long their stay. Payment of the tonlieu was manifest in an insignia – a visa – on a passport, which amounted to a receipt for payment. If you were in country without a current visa, you were not reliably under the sovereign’s protection, and so (in general, and with due allowance for differences in the detail of enforcement from one domain to another) might be fair game for footpads and highwaymen, thieves and burglars, muggers and fraudsters; and might be without recourse in any local court of law (which usually amounted to the throne room of the local sovereign); and might furthermore be subject to immediate deportation upon detection by the cops, if not also taking without compensation (in such cases the cops would take their cut of the expropriated assets and pass them up the hierarchy, with each level taking a cut, and the sovereign fisc last in line, although not least)(“civil forfeiture” has been around for a very long time: ‘cop’ is from the Latin capere, to take).
The recent proposals for tonlieux vary considerably. Since I’ve been talking up the notion for years, I might as well here offer a more detailed explanation of what I would propose. It is of course subject to change as I learn more.