Asano's clan steward, Oishi Kuranosuke, and forty-seven of his loyal retainers vowed revenge.
Oishi Kuranosuke had 20 loyal retainers who vowed revenge.
mnli hypothesis: Oishi Kuranosuke had 20 loyal retainers who vowed revenge. premise: Asano's clan steward, Oishi Kuranosuke, and forty-seven of his loyal retainers vowed revenge.