When discussing historical events or asking about the timing of an occurrence, the phrase "in what period" may be used. However, there are several synonyms available to express this question, including "during what era," "in what epoch," "within what timeframe," "at what point in time," and "during what age." These phrases convey the same basic meaning but may be used in different contexts. For example, "during what era" might be used when discussing a specific time period in history, while "within what timeframe" could be used in a business setting when discussing project deadlines. Regardless of the specific synonym used, the intent remains the same - to ask about the timing or duration of an event or phenomenon.