Is English the only language where "I" is always capitalized, no matter where it occurs in a sentence? The other two languages that I'm familiar with don't do this.
In German, "ich" is only capitalized at the start of a sentence; the same is true for "yo" in Spanish.
If English is unique in this regard, or even if among a subset of languages that do this, is there a historical reason behind it? A philosopical or cultural one, or...???