Unification and Byzantium

The substance of Nemanja’s reign was the making of a state. Over some three decades he absorbed coastal Zeta and the neighboring Serbian lands into a single realm ruled from Raška, and he did it in a long, shifting contest with Byzantium — submitting as a humbled vassal to Manuel I in 1172, then exploiting the empire’s collapse after 1180 to expand southward and eastward, meeting Barbarossa’s crusade at Niš in 1189, and, after a defeat on the Morava in 1190/1191, accepting a negotiated peace that sealed his gains and bound his dynasty to the Byzantine imperial house.

Tradition: Serbian Orthodox

The Program of Unification

Nemanja’s central achievement was to transform the loose confederation of Serbian župas into a unified principality with a fixed dynastic center in Raška. Over the course of his reign he brought under his direct rule the coastal land of Zeta (Duklja) — the old rival center — together with its Adriatic towns, and extended his authority over neighboring Serbian districts, absorbing the appanages of his subdued brothers and pressing outward at the expense of Byzantium and of local lords (Fine, The Late Medieval Balkans, pp. 3–8; Obolensky, Six Byzantine Portraits, ch. 4). The tradition credits him with taking or dominating a string of towns and regions — among them Kotor on the coast, and inland Niš, Prizren, Skopje (Skoplje), and the lands along the Morava and toward the Bulgarian frontier — though the precise extent and the permanence of each conquest vary in the sources (Simeon the Myrrh-flowing, OrthodoxWiki; Stefan Nemanja, English Wikipedia; Fine, The Late Medieval Balkans, pp. 3–10).

[Disputed: The exact territorial extent of Nemanja’s conquests, and which gains were permanent versus temporary, are not uniformly reported; the coastal towns and the core of Zeta were durably incorporated, while the eastern and southern conquests (Niš, the Morava lands, the approaches to Skopje) fluctuated with the fortunes of the Byzantine wars and were partly surrendered at the peace of 1190/1191 (Fine, The Late Medieval Balkans, pp. 3–10; Stefan Nemanja, English Wikipedia). The core achievement — a unified Serbian realm centered on Raška and including Zeta — is secure.]

The point of the unification was not merely more territory but a durable dynastic state: a realm that would hold together and pass intact to his heirs, rather than fragmenting again into rival župas. In this Nemanja succeeded where earlier Serbian rulers had failed, and it is the foundation of everything the Nemanjić dynasty became (Obolensky, Six Byzantine Portraits, ch. 4; see The Holy Dynasty and Serbian Orthodoxy).

Vassalage and Rebellion: The Submission of 1172

The unification was pursued against the constant pressure of Byzantium, and the first phase ended in defeat. Emboldened, perhaps, by an anti-Byzantine coalition of the period (Venice, Hungary, and others opposing Manuel), Nemanja rebelled against imperial overlordship — and was crushed. In 1172 the emperor Manuel I Komnenos compelled Nemanja’s submission, and the tradition preserves the humiliating form it took: the Serbian ruler is said to have presented himself before the emperor as a penitent suppliant — barefoot, bareheaded, with a rope around his neck and his sword surrendered — to beg forgiveness, after which he was led in Manuel’s triumph at Constantinople and then restored to his throne as a chastened vassal (Stefan Nemanja, English Wikipedia; Fine, The Late Medieval Balkans, pp. 3–8; Obolensky, Six Byzantine Portraits, ch. 4). Whatever the exact ceremonial, the substance is clear: down to 1172 and beyond, Nemanja held his realm as a subordinate of the Byzantine emperor, and open defiance had failed.

Exploiting the Collapse: Expansion After 1180

The death of Manuel I in 1180 changed everything (see Byzantium and the West). With the strong emperor gone and Byzantium sliding into the disorders of the 1180s, Nemanja shifted from chastened vassal to aggressive expansionist, pushing his frontiers south and east into now-weakly-defended imperial territory and taking or raiding a series of towns along the great roads (Fine, The Late Medieval Balkans, pp. 3–10; Stefan Nemanja, English Wikipedia). This is the phase in which the Serbian realm reached its widest extent under Nemanja, and in which he acted, for a time, as an independent power rather than a Byzantine client (Obolensky, Six Byzantine Portraits, ch. 4).

Barbarossa at Niš, 1189

The high point of Nemanja’s anti-Byzantine ambition came with the Third Crusade. In the summer of 1189 the German Emperor Frederick Barbarossa led his crusading army down the great Balkan road toward Constantinople, and at Niš — a town Nemanja controlled — the Serbian ruler met him, received him with honor, and sought an alliance against Byzantium, offering to recognize Barbarossa’s overlordship and to join him against the emperor Isaac II Angelos (Fine, The Late Medieval Balkans, pp. 9–10; Stefan Nemanja, English Wikipedia). The overture came to nothing — Barbarossa, intent on reaching the Holy Land and unwilling to be entangled in a Balkan war, declined the alliance and marched on (he would drown in Asia Minor in June 1190) — but the episode shows how far Nemanja’s independence had grown, and how openly he now worked the Latin-crusading West against the Byzantine East (Fine, The Late Medieval Balkans, pp. 9–10; see Byzantium and the West).

The Defeat on the Morava and the Peace of 1190/1191

With Barbarossa gone and the crusade past, Byzantium under Isaac II Angelos turned to punish the overreaching Serbs. In a campaign dated to 1190 or 1191, Isaac led an expedition against Nemanja and defeated him at the South Morava river; the Byzantine forces raided the Serbian lands around the river and, in the tradition’s account, burned Nemanja’s court at Kuršumlija, forcing him to retreat into the mountains (Fine, The Late Medieval Balkans, pp. 9–10; Stefan Nemanja, English Wikipedia). But the defeat was not a disaster: Byzantium, itself weak and preoccupied, sought not to destroy the Serbs but to recover key positions and to make allies of them, and the war ended in a negotiated peace (Fine, The Late Medieval Balkans, pp. 9–10).

[Disputed: The battle on the South Morava is dated 1190 by some accounts and autumn 1191 by others; the sources do not fix the year firmly, and both are current (Stefan Nemanja, English Wikipedia; Fine, The Late Medieval Balkans, pp. 9–10). The outcome — a Serbian defeat followed by a negotiated peace — is agreed.]

The peace was sealed in the classic Byzantine manner, by a marriage alliance. Nemanja was obliged to surrender some of his more recent conquests, but he was allowed to keep the substance of his gains, and his authority over a unified Serbia was in effect recognized; and his second son and designated heir, Stefan (the future First-Crowned), was married to Eudokia (Eudokia Angelina), a niece of the emperor, binding the Serbian ruling house to the reigning Byzantine dynasty (Fine, The Late Medieval Balkans, pp. 9–10, 41–42; Stefan the First-Crowned, English Wikipedia). This alliance would matter enormously at the end of Nemanja’s life: it was the kinship with the Angelos house that helped his son Sava obtain from Alexios III Angelos the chrysobull for Hilandar in 1198 (see Vatopedi and the Chrysobull).

The Shape of the Achievement

Nemanja’s Byzantine policy was neither consistently loyal nor consistently rebellious; it was opportunistic and effective, bending to the empire when the empire was strong and pressing against it when it was weak, and ending in a settlement that left Serbia unified, enlarged, and dynastically tied to Constantinople (Fine, The Late Medieval Balkans, pp. 3–10; Obolensky, Six Byzantine Portraits, ch. 4). The deepest result was not any particular border but the fact of a durable, Byzantine-oriented Serbian state — the political body whose church his sons would make autocephalous and whose dynasty they would make holy. When, in 1196, Nemanja laid down this realm to become a monk, he handed his heir a unified kingdom secured by a Byzantine marriage; the statecraft of the unifier was the necessary platform for the sanctity of the renouncer (see The Great Renunciation).

References

Fine, John V. A., Jr. The Late Medieval Balkans. Ann Arbor: University of Michigan Press, 1987, pp. 3–10, 41–42. On the unification, the submission of 1172, the expansion after 1180, Barbarossa at Niš, the Morava campaign, and the peace and marriage alliance.
Obolensky, Dimitri. Six Byzantine Portraits. Oxford: Clarendon Press, 1988, chapter 4. On Nemanja’s state-building within the Byzantine commonwealth.
Stefan Nemanja, Simeon the Myrrh-flowing, and Stefan the First-Crowned. English Wikipedia and OrthodoxWiki (used to locate the conquests, the 1172 submission, the Morava battle of 1190/1191, and the Eudokia marriage; pinned as tradition under METHODOLOGY §3.5).