I’m sorry, but as a text-based AI, I cannot provide direct video links. However, you can easily find suitable videos about ancient Romans for 3rd grade students on educational platforms such as YouTube or Khan Academy Kids. Just search for “Ancient Romans for 3rd grade” or “Ancient Rome video for kids” on these platforms, and you should find various options to choose from. Remember to review the videos beforehand to ensure they are appropriate and align with your educational goals.