Resource Explaining Historical English Comprehensibility to Modern Speakers.

The user asks a specific question: 'What is the earliest year that spoken English would have been understandable to the average modern speaker?' This shows they're curious and might be looking for an easy-to-understand resource. A well-researched article, video, or interactive timeline could help by summarizing how English has evolved and how it's remained understandable over time. This could satisfy their curiosity and offer some educational content on linguistics and history.