I apologize for any confusion. Upon reviewing your original query again, the following sentences are indeed correctly formatted in a time-related context:
- William of Normandy crossed the English Channel and defeated King Harold II in A.D. 1066.
- Alexander the Great died in 323 B.C.E.
- Romulus Augustulus, the last Roman emperor, was taken prisoner by the German king Odovacar in C.E. 476.
- Julius Caesar was assassinated in B.C. 44.
The sentences are correct in terms of the historical claims and the use of time-related terms. The variations with a space before the period (e.g., "A.D. 1066 ." instead of "A.D. 1066.") were incorrect punctuation but still represented the correct historical dates.
So yes, all four sentences are accurate historical statements but only the first instance of each sentence (with proper formatting before the period) should be selected:
- William of Normandy crossed the English Channel and defeated King Harold II in A.D. 1066.
- Alexander the Great died in 323 B.C.E.
- Romulus Augustulus, the last Roman emperor, was taken prisoner by the German king Odovacar in C.E. 476.
- Julius Caesar was assassinated in B.C. 44.
Make sure to note the formatting for a complete precision check. Thank you for your understanding!