The phrase "actually arisen" is correct and usable in written English.
It can be used to indicate that something has genuinely occurred or come into existence, often in a context where there may be doubt or surprise about its occurrence.
Example: "The issues we discussed have actually arisen, and we need to address them immediately."
Alternatives: "truly emerged" or "genuinely occurred".
Someone who reads a lot of right-wing blogs in the United States these days might be forgiven for thinking so, though there is no sign here that any such Islamist clamor to destroy the monuments of ancient Egypt has actually arisen.
This suggested that anthropoids may have actually arisen in Asia and then migrated to Africa a few million years later.
Of course, one way of avoiding the threat would be to deny that there are in general any facts about what people would have freely done in circumstances that have not actually arisen; there may be facts about what they might have done, or what they would very probably have done; but not what they would have done.
The cultural and political battle which has actually arisen is one against — bizarrely, surreally — 19th-century style ethno-nationalism; against people who want to forcibly deport millions from their homes, people who want to oppress minorities of all kinds, and, not least, outright white nationalists.
That is where all the problems have actually arisen.
Nevertheless, accumulating evidences show that some JEV strains may have actually arisen from RNA recombination between genetically different populations of the virus.
People are anticipating problems that may not actually arise".
Interestingly enough, one of our books predicted the rise of a caliphate before Isis actually arose".
"We want to plant a thousand seeds and see how many flowers actually arise".
Most water-related conflicts around the world actually arise at the consumption phase.
This was not surprising — San Francisco is the capital of broad politics — but I couldn't see where ideological disputes actually arose.
