These begin your sentences and are home to your leaders.

“Capitol”

While 'Capitol' refers to a building where a legislative assembly meets, it does not relate to the beginning of sentences or the concept of capital letters.

“City”

A 'City' can refer to a place where leaders are based, but it does not pertain to the grammatical aspect of starting sentences.

“Letter”

Although letters are part of sentences, the term 'letter' does not specifically denote the capital letters that begin sentences.