He's his page. It's like a personal servant who can work their way up to more important roles.
A page is a type of attendant or helper to a noble. So a lord like Nobunaga would have pages to help him with his daily tasks (like getting dressed for example). Nobunaga giving him the hair tie shows he wants Ranmaru to tie his hair up and get him dressed for the day - he wants Ranmaru as his page to keep him close. Hope that helps!
Page is basically just a personal servant and I think he gave him the hair tie to signify that he would be the one to help him get ready again like tying his hair back for him
thank you so much everyone!! (▰˘◡˘▰)
I am not an native english speaker and im kinda lost after all the time since the last time we were on old japan, what does being a Page means? And giving him the hair tie? Thank you!