Combine flour, salt, rosemary, and olives and toss to coat.
Add in remaining ingredients and mix until just combine. This is a wet dough, but it shouldn't be super sticky.
Let sit 20-30 minutes then with a wet hand gently knead it. This is when you add more flour if you want.
Let rise until doubled, about 6-8 hours in a warm house with happy starter.
Shape into one large rustic loaf on a baking pan or two smaller loaves in loaf pans.
Let rise until almost doubled then turn oven on to 375°F.
Give it a good slash on top.
Bake single loaf for 25 minutes, turn around and then another 20 minutes. For two smaller loaves, do 20 and 15 minutes.
I always check the temperature of my loaves to make sure they are done. Aim for about 180°F in the center of the loaf.