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Ultramarines Background
The drifting capsule of one of the twenty such Primarch embryonic pods landed on the planet Macragge. Macragge had been inhabited by humans for centuries, and, while bleak, still maintained a good industrial base, and even contact with neighboring systems, despite the dangerous warp storms during the Age of Strife.

The capsule was discovered by a group of hunting nobles, and the striking infant within was taken to Konor Guilliman, one of the leaders of Macragge. Konor adopted the child as his son, and named him Roboute.

All was not well on Macragge, as bandits, brigands, and rebels posed a threat to civilization. Roboute grew quickly, his genetic supremacy becoming apparent at a very early age. As a war strategist and tactician, he was unmatched. Roboute led armies that crushed the malcontents, bringing Macragge under a single rule - his own.

By the time the Emperor discovered the Primarch, he had been in power for five years, with a flourishing economy, a large, well-equipped military, and regular trade with nearby systems. Roboute eagerly and skillfully assumed his role as leader of the Ultramarines Legion.