Kevin, I would go with 'rein', I think it comes from giving the horse a free rein and not directing it rather than anything to do with monarchy.
You talk about concrete for vertical walls, are they retaining walls holding back earth? If you look at such walls on places like rail embankments you will see that brick ones use English bonding, every other brick a header, the strongest bond. They need strength, the earth will always gradually move down hill and the pressure build and build, to hold it back you need a decent foundation and some steel in the wall if it is concrete
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