The simple answer is yes.
History, however, is not a science, and its study is anything but simple.
However, there is one good example. The only place that Pontius Pilate is mentioned is in Christian texts, and one brief notice in Tacitus. The works of Tacitus are known to have been vandalized with interpolation--an interpolation is when a text is copied, and the copyist adds material to the text. A famous passage in Tacitus which Christians point to as evidence that the putative Jesus existed has been shown (to the satisfaction of historical scholars, at least) to have been an interpolation. A copyist in the Vatican at some time in the 15th century added text to a copy of Tacitus (the passage is not known to have existed before the 15th century), and the page from which it was copied disappeared.
Therefore, the mention of Pilate by Tacitus was also suspect as a possible interpolation. However, in 1961, an Israeli archaeological team was excavating at the site of Caesarea Maritima, which was the administrative center from which Iudaeae (Judea) was governed. There they found an inscription in an amphitheater which names Pilate.
This doesn't prove any of the Christian stories about Pilate and the crucifixion of the putative Jesus. But it does prove that there was a Roman official named Pilate who lived at that time. The incomplete inscription reads:
TIBERIEUM,,
-TIUS PILATUS
-ECTUS IUDA-
This is reasonably assumed to read: "Tiberieum (a part of the dedication to the Emperor Tiberius), [Pon]tius Pilatus, [Pra]fectus Iuda[eae]--[to] Tiberius, [by] Pontius Pilate, Prefect of Judea."
So, no one now questions that Pilate actually existed.