For generations after that, his writings were read, analyzed, and reproduced. The earliest manuscript of a Plautus play dates from the sixth century CE, and the re-emergence of previously lost texts re-popularized Plautus throughout the Renaissance. During this time, several more manuscripts came to light, including one containing five complete plays. As more and better copies of his work began to appear, scholars started to argue about its authenticity. Some believed it was not written by Plautus at all, but by another author using his name as cover. Others argued that it was possible to identify characteristics of style and subject matter that distinguished it from other Roman comedies of the day. But despite these doubts, Plautus' reputation as one of the most important comic writers in world history remained secure. As more manuscripts were discovered and studied, some differences between them became apparent. For example, some contain all their acts on single pages while others divide them up into scenes or episodes. Also, some have more than four acts while others have only three or five. Finally, some plays are missing many lines of dialogue and some have different names than those found in other copies of the same play. Despite these variations, the majority of Plautus' works can be classified into two groups based on the type of production they would have accompanied had they been performed.