Shout-out to my Patron Joshua for coming up with the series name.

Twitter: https://twitter.com/Tenminhistory
Patreon: https://www.patreon.com/user?u=4973164
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Special Thanks to the following Patrons for their support on Patreon:
Franco La Bruna
Daniel Lambert
Richard Wolfe
Joshua
Mitchell Wildoer
anon
Andrew Niedbala
Blaine Tillack
William Foster
Bernardo Santos
Cornel
Norman A. Letterman
Danny Anstess
Perry Gagne
Henry Rabung
Shaun Pullin
Joooooshhhhh
Daan ter Elst
Paul
FuzzytheFair
Byzans_Scotorius
Spencer Smith
Mark Bevan
João Santos
Ryfael
Rbj
Richard Manklow
Chris Fatta
Andrew Keeling

How on earth did Ancient or Medieval Borders work? Find out here and learn all about headless tribes and the concept of a frontier whilst doing so.

Sources:

Historical Ecosystem: Roman Frontier and Economic Hinterlands in North Africa by Orietta Dora Cordonova (2012).

Frontiers and Borderlands in Imperial Perspectives: Exploring Rome's Egyptian Frontier by Anne Lucille Boozer (2013).

England, Scotland and Europe: The Problem of the Frontier by D. Hay (1974).

Scottish Influences on the Medieval Laws of the Anglo-Scottish Marches by Cynthia Neville (2002).