So Roman rule ended with the transition of power to the Visigoths. Thanks for clearing that up.
Wallia became a close ally of Roman Emporer Honorius and was recognized by treaty as a Foederatus of the empire with settling rights in Iberia, thus completing the cession as Rome withdrew.
In other words, Visigothic Iberia was an ally of Rome but had a very different legal and administrative system and was recognized both by its own rulers and those of Rome to be a new state on the peninsula.
Through the hereditary line of the Visigothic kingdom.
Which is another break with the Roman administration of the province. Furthermore, Honorius's grant to Galla Placida could not pass through hereditary succession because neither she nor her husband left any heirs. As Gibbon describes it:
The fondness of Adolphus for his Roman bride, was not abated by time or possession: and the birth of a son, surnamed, from his illustrious grandsire, Theodosius, appeared to fix him forever in the interest of the republic. The loss of that infant, whose remains were deposited in a silver coffin in one of the churches near Barcelona, afflicted his parents; but the grief of the Gothic king was suspended by the labors of the field; and the course of his victories was soon interrupted by domestic treason. He had imprudently received into his service one of the followers of Sarus; a Barbarian of a daring spirit, but of a diminutive stature; whose secret desire of revenging the death of his beloved patron was continually irritated by the sarcasms of his insolent master. Adolphus was assassinated in the palace of Barcelona; the laws of the succession were violated by a tumultuous faction; and a stranger to the royal race, Singeric, the brother of Sarus himself, was seated on the Gothic throne. The first act of his reign was the inhuman murder of the six children of Adolphus, the issue of a former marriage, whom he tore, without pity, from the feeble arms of a venerable bishop.
The line eventually passed to Pelagius of Asturias, the highest nobleman to survive,
Since you have proven eager to hide unpleasant facts in vagaries, you will have to prove the legitimacy of Pelayo's claim.
Actually a Roman Foederatus was recognized as a subordinate state, entreatied by alliance to Rome.
...except that Rome entered into treaty to cede its administration of Iberia to them.
Furthermore, Honorius's grant to Galla Placida could not pass through hereditary succession because neither she nor her husband left any heirs.
Ah, but the Visigothic line did produce an heir after Athaulf's (Adolphus in some translations) assassination - Wallia. Wallia entered into the treaty with Honorius.
Since you have proven eager to hide unpleasant facts in vagaries, you will have to prove the legitimacy of Pelayo's claim.
Your gratuitous insults aside for the moment, Pelagius (or Pelayo in some versions) obtained his legitimacy by visigothic law. He was member of Roderic's court and nobleman of the Asturius province in northern Spain. Pelagius was also one of the only Visigothic noblemen to survive. Visigothic law stated that in an interregnum with no direct heir of the previous monarch, the successor would be selected by a vote on candidates chosen from the remaining nobility, which Pelagius did circa 718 when he began the reconquista.