There is a funny anecdote that after the Battle of Pavia in 1525 a lowly Spanish arquebusier named Roldan approached the captured French king Francis I to inform him that he had a special gold bullet prepared to shoot him during the battle, and wanted him to have it - to contribute to his ransom.
This story was recorded by another Spanish soldier who participated in battle Juan de Oznaya:
"And then there arrived a Spanish soldier, an arquebusier named Roldán, a truly fitting name for such a valiant man. He came to the king carrying in his hand two bullets made of silver and one of gold, and he told him:
'Lord, your highness should know that when I found out yesterday that the battle would take place today, I cast six silver bullets for your noble vassals and one of gold for yourself. I believe I made good use of four out of six silver bullets, for I fired them into gilded brocade and crimson shirts. I fired off many others, made of lead, towards the common people, because I could not come across more noblemen, and thus I have two left. But this gold one right here (you should thank my goodwill) I saved to ensure you the most honorable death that a prince has ever received. God did not want me to see you during the battle, so here you go, have it and count it as my contribution to your ransom, for it is one ounce, worth eight ducats.'"