Timelines are visuals of events over a period of time. There are many timeline creators for web use. Most of these are not appropriate for printing. Pages (MAC), Microsoft Word, and spreadsheets can be used to create timelines to add to an infographic. Do a google image search for timelines to see a variety of timelines to generate ideas.

Create a Timeline in Microsoft Office 2010
Here are the instructions for making a timeline in Office.

Make Your Own Timeline
Younger students can learn how to make timelines from Enchanted Learning.

TImetoast Timeline - this is a phenomenal tool. Now students can create a timeline and share it with others online. This is better viewed online than in print.