Basil was the illegitimate son of the emperor Romanos I Lekapenos by a concubine. It is reported that his mother was a slave woman of "Scythian" origin, but according to Kathryn Ringrose " this may just be a pejorative topos". The exact date of his birth is unknown; the Oxford Dictionary of Byzantium suggests ca. 925, while the Dutch scholar W. G. Brokaar suggested sometime between 910 and 915. Later Byzantine chroniclers like John Skylitzes, Zonaras, and Kedrenos, claim that Basil was castrated as an adult, following the deposition of his father in 944; Michael Psellos however reports that this was done for political reasons during his infancy, a view supported by modern scholars like Brokaar and Ringrose, since castration of adults was considered dangerous and was rather rare. His role during the reign of his father is unknown. He first appears as the protovestiarios of Constantine VII Porphyrogennetos, the legitimate emperor of the Macedonian dynasty, but it is unclear whether it was Romanos Lekapenos who appointed him to the post or whether Constantine VII gave it to him after Romanos' downfall. The contemporary Theophanes Continuatus reports that Basil was a loyal and dedicated servant of Constantine VII, and had a close relationship with Constantine's wife, and his own half-sister, Helena Lekapene. Following the deposition of Romanos Lekapenos in December 944, Basil supported Constantine VII when he regained power from Basil's half-brothers Stephen Lekapenos and Constantine Lekapenos in January 945, and was rewarded with senior titles and offices: in his seals and dedicatory inscriptions he is called a basilikos, patrikios, "paradynasteuon of the Senate", as well as megas baioulos of Constantine's son and heir, the future Romanos II. In ca. 947/8 he was raised further from protovestiarios to parakoimomenos, in succession to Theophanes. In 958, he led troops to the East to reinforce the general John Tzimiskes in his campaign against the Arabs: the Byzantines stormed Samosata and inflicted a heavy defeat on a relief army under the Hamdanid emir of Aleppo, Sayf al-Dawla. The Byzantines made many prisoners, including relatives of the Hamdanid emir. As a result, Basil was allowed to celebrate a triumph in the Hippodrome of Constantinople, where the captives were paraded before the populace of the Byzantine capital. Basil was an opponent of the Patriarch Polyeuctus and sought, with some success, to turn the emperor against him. According to the sources, this was because the patriarch castigated the avarice of the Lekapenoi and their relatives. He was at Constantine VII's side during his final days, and was the one who wrapped his corpse with its burial shroud.
Upon his accession, Romanos II dismissed him and favoured another official, Joseph Bringas, who assumed Basil's positions of paradynasteuon, protos, and parakoimomenos. This began a fierce rivalry and even hatred between the two men. Basil remained on the sidelines for the duration of the reign, but when Romanos died in early 963, his sons Basil II and Constantine VIII were underage, and a struggle for the throne erupted. Basil sided with the distinguished general Nikephoros Phokas against Bringas. Basil armed his numerous attendants—some 3,000 according to the sources—and with the urban mob attacked Bringas and his supporters and seized control of the city and the ports. Bringas sought sanctuary in the Hagia Sophia, while Basil mobilized the imperial dromon and other vessels to Chrysopolis, where Phokas awaited with his army. Phokas entered the city, and was crowned senior emperor as guardian of Romanos II's young sons. As a reward for his role in Phokas' elevation to the throne, Basil was restored to his old post as parakoimomenos and received the new exalted rank of proedros. The elevation to this office involved a special ceremony, included in the De ceremoniis, and possibly written or edited by Basil himself. It is unclear what role Basil played under Phokas. The report of Liutprand of Cremona during his visit in 968 shows him among the senior dignitaries of the Byzantine court, but the second man of the regime was clearly Nikephoros' younger brother, the kouropalates and logothetes tou dromouLeo Phokas the Younger. Although he did not take part in the assassination of Phokas by Tzimiskes in December 969 by feigning illness, he knew of it and threw his full support behind Tzimiskes' assumption of the throne afterward, sending his agents to the city to warn the populace against fomenting unrest or engaging in plunder. According to the contemporary historian Leo the Deacon, Basil was a close friend of Tzimiskes, but it may also be that Basil's support for this coup was an effort to safeguard the position and rights of his nephews Basil II and Constantine VIII, as a continuation of the Phokas regime would likely have seen Leo Phokas succeed his brother. Basil helped the new emperor get rid of Phokas' supporters and relatives. He also assisted in the retirement of Romanos II's and Phokas' widow, Theophano, and advised Tzimiskes to cement his position by marrying Theodora, a daughter of Constantine VII. Under Tzimiskes, Basil played a leading role in the governance of the state, especially in the fiscal administration, while Tzimiskes himself was more concerned with foreign policy and his military campaigns. Basil himself took part in the great campaign against the Rus' in Bulgaria in 971, having been entrusted with the reserve forces, the baggage train and the supply arrangements, while Tzimiskes himself with his elite troops marched ahead. During this period, Basil amassed a huge fortune, including entire settlements in the recently conquered southeastern portions of Anatolia. Leo the Deacon mentions the localities of Longias and Drize, while Skylitzes reports that he owned the region between Anazarbos and Podandos. These riches were the cause of Basil's break with Tzimiskes; the sources report that on his return from campaign in Syria in 974, the Emperor saw the vast estates belonging to Basil, and resolved to move against him. Learning of this, Basil arranged for Tzimiskes to be poisoned, although the sources differ on how and where this was done. Modern scholars are skeptical towards these reports; as Kathryn Ringrose writes, "contemporaries believed that eunuchs, like women, rarely fought men honorably and instead resorted to poison and to other underhanded tricks", while the Oxford Dictionary of Byzantium speaks of "rumours that had been poisoned by Basil the Nothos". All that is certain is that Tzimiskes fell ill during his campaign and died in Constantinople shortly after his return.
Career under Basil II
He continued in office in the early reign of Basil II but in 985 the young Emperor - wishing to assume the government himself after being dominated by regents and caretaker emperors for thirty years - accused him of sympathizing with the rebel Bardas Phokas and removed Basil from power. All his lands and possessions were confiscated and all laws issued under his administration were declared null and void. Basil Lekapenos himself was exiled and died shortly afterwards.
