Within the SCA I have a number of different and meaningful relationships that have developed over time.
Firstly, I am squired to a knight. With that I gained a number of squire-brothers.
I am also an apprentice, and that garnered me a gaggle of feral belt-sisters.
My knight and laurel are married and have a joint household, but I am also a member of another household, symbolized by the raven. Due to that I have my raven-brothers and -sisters.
This, as anyone who has been in the SCA for any period of time can tell you, is pretty standard.
However, I have one other set of SCA siblings: my sword-brothers. Sometimes, when a fighter truly inspires me (both on and off the field), and we have a bond and I wish we were squire-brothers though we are not, I approach them and ask if they would honour me by being my sword-brother. They are my brothers-in-arms who (aside from my squire-brothers) I would most like to stand with on the field. Over the years I have asked a handful of people to stand so, and all but two have said yes.*
The first of them were His Excellency Berend van der Eych, who at the time was squired to Duke Finnvarr de Taahe (though now both he and I are squired to Sir Nigel). So he is both a squire-brother and a sword-brother, and chiefest of this company.
This was followed by Sir Wat of Sarum (who was not even a squire at the time), THL Amelius Claudius Rattanicus and Lord Edward dit Lyon.
At a non SCA (but SCA related) event this past weekend, I approached another fine noble, and told him how I have come to admire him as he has grown and evolved over the past few years. He is always striving to improve himself and his game, has taken on thankless jobs which he handles with aplomb, and is quite frankly an excellent human being. I asked him to stand as a sword-brother, and he agreed. I am proud to include Lord Fulk Beauxarmes among my band of stalwart friends and comrades.
To symbolize our bond, I give each of my sword-brothers a sword (though it may be miniature in size). Fear not, Fulk; your's will be forth-coming.
* I should add, that the two people who said no were already a raven-brother and -sister and felt no further proof of bond was required.