Roble Holy Kingdom

Roble Holy Kingdom (ローブル聖王国) or more commonly referred to as the Holy Kingdom is a human nation which occupied the peninsula located southwest of the Re-Estize Kingdom.

Background
The Holy Kingdom as it is simply called, is marked haphazardly on maps of the New World. Its land is divided into north and south halves by the sea, but the halves are not completely separate. Rather, a gigantic bay, four kilometers long and two and a half kilometers wide, made its geography look like a U turned on its side. For this reason, some people refer to the Holy Kingdom as the "Northern and Southern Holy Kingdoms". The Holy Kingdom's national hero is said to be a valkyrie knight, wielding a sacred blade.

The Holy Kingdom is neighbored by the Abelion Hills, which are inhabited by all kinds of demi-human tribes who are constantly warring with one another. In order to prevent themselves from being invaded and/or getting caught up in their wars, the Holy Kingdom invested a great amount of time and resources to build a wall along it's border to keep the demi-humans out; this would become known as the 10,000 Mile long Great Wall. There are only three gates along the entire length of the wall, which are heavily fortified. These fortresses also function as garrisons as well as staging areas should the demi-hunans invade.

However, despite all of these defensive measures, the Holy Kingdom still remain vigilant of the constant danger and it still suffers from attacks from time to time. The gravest of these invasion came during the period known as the "Long Rain". It was a type of night attack instigated by a race called the Srush who were able to scale the wall and head deep into Holy Kingdom's territory. In the end, the Srush were driven back, though at the loss of several of the Holy Kingdom's villages.

While the wall may be massive to humans, it is no obstacle to to races who are several times their size, can fly or possess some sort of special ability. This caused the Holy Kingdom's nobles to grow paranoid, resulting in the passing of a law to conscript all citizens. Once a citizen of the Holy Kingdom comes of age, they will undergo military training so they can protect they nation should it ever become necessary.

The Lizard Man Heroes Arc
Ainz explains to Albedo in great details about the geography of the Holy Kingdom and it having a wall used to prevent demi-human tribes from encroaching into their territory.

The Men in the Kingdom Arc
It was around this time that Demiurge had already starting preparations to initiate Operation Gehenna in the Holy Kingdom, however, due to certain circumstances he had to initiate it in the Re-Estize Capital.

The Invaders of the Large Tomb Arc
While comparing the strengths of all the leading swordsmen in the lands, the Holy Kingdom's Valkyrie Knight was mentioned by the workers.

The Ruler of Conspiracy Arc
After the massacre at Katze Plains and the establishment of the Sorcerer Kingdom, Demiurge was assigned a mission within the Holy Kingdom for what purpose is still not clear.

The Craftsman of Dwarf Arc
After Ainz finished his business in the Dwarf Kingdom, Demiurge began to set his plans for the Holy Kingdom into motion.

Politics
It was a highly religious country, led by the Holy Queen, Calca Bessarez who could use divine magic and who was closely affiliated with the churches. That said, they were not as religiously-oriented as the Slane Theocracy.

Military Strength
Due to dangers from the demi-humans that live in the Abelion Hills are a constant threat to their nation, the Holy Kingdom built the wall which is patrolled by several units. However, due to the limited population of the country and the large scale to monitor it, the Holy Kingdom's military conscript their citizens when they reach a minimum age to join. In other words, the citizens of the Holy Kingdom were conscripted as a form of national service. Nearly anyone who was at least an adult, a citizen of this country, and both male or female capable of handling military duty must take part in their country's affair militarily.

Thus, they would become soldiers and need to spend a certain amount of time being trained, after which they would be assigned to sentry duty on the wall. If the worst were to happen such as the wall being breached, it was even made possible by the former Holy King of the nation to result in mobilizing the entire nation as a drastic response against incoming invaders. The hope was that the country's own citizens would become the manpower with which to protect their land in case the demi-humans by chance crossed over the wall.

Although they wanted to fully man the wall in order to prevent an event like the Long Rain from ever happening again, stationing troops at every single point along its length would strain the nation. Instead, they came up with a viable solution which was to build outposts at fixed intervals along the walls. These strong-points would then be overseen by gigantic fortresses. They stationed a small number of troops in these bases, their purpose being to fight for extended periods, to the last man.

If they managed to encounter an enemy attack however, they would first launch flares to request reinforcements. In addition, there were companies of soldiers who would staff and patrol the fortresses, serving as reserve troops during emergencies, to be deployed as the situation required. After putting these measures into practice, the demi-humans weren't able to penetrate the wall again for now.

With great support, all village residences of a certain size were also fortified. This gave the local villagers enough fighting power to hold out until the regular army could arrive, and allowed said villages to serve as military outposts.
 * Nine Colors

Known Characters from Roble Holy Kingdom

 * Calca Bessarez - Queen
 * Remedios Custodio
 * Babel Baraja
 * Orlando Campo
 * Neia Baraja

Trivia

 * In the Web Novel, it is stated that the Holy Kingdom have once maintained connections with the Slane Theocracy, but due to the encroaching warring demi-human tribes, the latter lost contact.
 * Demiurge was sent to the area and collected the skins necessary to produce magic scrolls.
 * The Great Wall here could be a reference to the Great Wall of China, built to keep out the Huns.
 * The villages of the Holy Kingdom were far better protected than those of other countries, and they could also function as military bases.
 * The Holy Kingdom practiced conscription. Therefore, they sometimes called those people who chose to be career soldiers as non-commissioned officers. They did so in order to differentiate them from those people who had been conscripted.