The Kasai-Ōsaki Uprising (葛西大崎一揆, Kasai Ōsaki Ikki) was a series of riots raised in protest by former Date retainers against Yoshikyo Kimura. The lands were previously Date territory but given control to a new lord as punishment due to Masamune's hesitation to support Hideyoshi's siege at Odawara Castle. Harsh taxes and general public discontent escalated into a various outbreaks of violence until it is under Date rule again.