The Deputy Prime Minister in the cabinet of Prime Minister Jawaharlal Nehru was Sardar Vallabhbhai Patel.

Sardar Vallabhbhai Patel was a prominent political leader and one of the key figures in the Indian independence movement. He played a crucial role in the integration of princely states into the Indian Union and is often referred to as the "Iron Man of India" for his firm and decisive actions.

During Jawaharlal Nehru's tenure as the Prime Minister of India from 1947 to 1964, Sardar Vallabhbhai Patel held the position of Deputy Prime Minister. This position was a significant one as it provided Patel with considerable authority and responsibility in the functioning of the government.

Here are some key points about Sardar Vallabhbhai Patel's role as the Deputy Prime Minister:

1. Integration of Princely States: One of the most significant contributions of Sardar Vallabhbhai Patel was his efforts in integrating the princely states into the Indian Union. At the time of independence, India had over 500 princely states, each with its own ruler. Patel worked tirelessly to convince these states to accede to India, using a combination of diplomacy, negotiations, and sometimes even force. His efforts resulted in the successful integration of these states into the Indian Union, thereby strengthening India's unity and territorial integrity.

2. Home Minister: In addition to being the Deputy Prime Minister, Patel also held the portfolio of the Home Minister. As the Home Minister, he played a pivotal role in establishing the administrative framework and policies for the newly independent nation. He focused on issues such as maintaining law and order, internal security, and refugee rehabilitation.

3. Chairing Key Committees: Patel chaired several important committees during his tenure as the Deputy Prime Minister. For instance, he led the States Reorganization Commission, which was responsible for redrawing the boundaries of states in India based on linguistic and administrative considerations. This led to the creation of new states and territories, such as Andhra Pradesh, Gujarat, and Maharashtra.

4. Foreign Policy: While foreign policy was primarily the domain of the Prime Minister, Patel also played an active role in shaping India's stance on international affairs. He worked closely with Nehru in formulating and implementing India's foreign policy, particularly in the early years of independence.

In conclusion, Sardar Vallabhbhai Patel served as the Deputy Prime Minister in the cabinet of Prime Minister Jawaharlal Nehru. He played a crucial role in integrating the princely states into the Indian Union, served as the Home Minister, chaired key committees, and contributed to India's foreign policy decisions. His leadership and contributions were instrumental in shaping India's early years as an independent nation.