LikedThis is Robert Silverberg, The Mass of Time, aka Vaughn 19, which is the story of a messianic alien who comes to Earth. And it's a really good Silverberg. It's one of the minor ones, but it's still well worth reading.
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The Masks of Time (1968)
Creators: Liked Vornan-19 fell from the sky, naked, and landed on the Spanish steps in Rome on Christmas afternoon toward the end of the Millennium. And for Leo Garfield things would never be the same. For he is an acknowledged expert in the time reversal properties of sub-atomic particles...and Vornan-19 claims to come from far in the future. Whether or not he is telling the truth, a nervous and edgy world accepts the charming and magnetically charismatic Vornan as some kind of messiah. Even Garfield and his fellow scientists fall under Vornan's spell. But, has he really traveled across time--or is he just a charlatan and a fraud? A compassionate and powerful novel worthy of comparison to Stranger in a Strange Land.
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John BrunnerMany a man would travel to the past for gold or God. Only the best efforts of Miguel Navarro and the Society of Time can protect the past, present, and future of the glorious Spanish Empire.
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Mixed reactions from creators4 reviews- Also science fiction76%
- A creator reacted alike13%
- Similar descriptions11%