None of the above. As Ron mentioned earlier you need to find the name of a Monarch and remove the first letter (the UK is not the only Country to have a Monarchy) What is left should then leave you with another name for Lamb (nothing to do with food unless it was for the guest of honour at the last supper) Should be a doddle for you now!
Decapitated Monarch turns into a lamb (5) Couple of questions; 1. Is it a current monarch? 2. Is the lamb a disciple/apostle?
1. Far from a current Monarch (from France you need to look northwards Ron) 2. You are on the right track but perhaps need a higher ranking personae?
Further clues to help you along: 1. The Monarch(s), there was more than one, with this name belong to a sea-faring warrior race 2, It is not part of a lamb you are seeking but an ancient alternative name (though it is still commonly seen)