Come before
Definition 1 of 3
Pro Tip 1/3Sequence Clarity
Use 'come before' to clarify the order of steps, events, or items. 
In a book, the introduction comes before the first chapter.
Pro Tip 2/3Not Physical
'Come before' often refers to order, not physical location. 
Breakfast comes before lunch, but the kitchen is where both are made.
Pro Tip 3/3Timeline Reference
It implies a timeline where one thing is positioned earlier than another. 
In history, the medieval period comes before the Renaissance.