These templates (gantt charts) are usable.
             Find the closest example to your history timeline  needs.
             Remember that everything can be modified by you  (everything:  the title,  tasks,  number of tasks,
             the numbers themselves,  the timeline names,  the number of timelines,  task durations,
             task dependencies,  start dates,  milestones,  colors,  everything)

             If you want to use an existing template  (chart, schedule, plan),  and are more comfortable
             following an example,  then select a template from the 'Example template' area.
             Once you have a template highlighted in one of the dropdown lists,  then press
             'Take to HelpUPlan Workspace'.  That page will show you the template you selected,  and
             it will also show you tabs which allow you to modify everything.