With the meat, or in a separate pan?
Again a choice to make - cooking them with the meat will give a better flavour to your oven roasted potato but it will not be as crispy.
Often you will find this choice is made for you, depending on what else you need to cook at the same time, how many roasting dishes you own, or whether you have a double oven.
If you have a single oven and are cooking a dessert in the oven at the same time as the main course then you may have to put the potatoes around the meat due to a lack of space.
If this is the case then you will normally need to cook them for longer at a lower temperature so as to avoid overcooking the meat.
If, however, you have a top oven available you can put them into a separate roasting dish and set the oven temperature higher, resulting in crispy roast potatoes.