きっての

きっての sits between two nouns and means "the finest in", "the most … of all": the first noun is the place or group, the second is the person or thing that stands out in it. It goes straight after the first noun, with no particle in between, and is sometimes written きって切っての.

• × 東京できっての名店 → 東京きっての名店

The first noun names a real group or place: a company, a town, a country, a team, an industry. For "in history", Japanese has しじょうさいこう史上最高の, and ×歴史きっての sounds wrong. The phrase is nearly always praise.

Register

きっての belongs to writing, news reports, introductions and speeches. It is stronger than いちばん一番 or もっとも最も. In conversation, きごう〜でいちばん一番の says the same thing: とうきょう東京でいちばん一番のみせ店.