The 420/Sovereign traces its origins back to the Jaguar Mark 2, which was introduced in 1959 and sold through most of the 1960s. The Mark 2 had a live rear axle and was powered by the XK six-cylinder engine first used in the Jaguar XK120 of 1948. The Mark 2 was available in 2.4, 3.4 and 3.8-litre engine capacities. James Taylor suggests four reasons why Jaguar boss Sir William Lyons might have decided to add yet another model to an already extensive Jaguar range:
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| - Jaguar 420 and Daimler Sovereign (1966–69)
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| - The 420/Sovereign traces its origins back to the Jaguar Mark 2, which was introduced in 1959 and sold through most of the 1960s. The Mark 2 had a live rear axle and was powered by the XK six-cylinder engine first used in the Jaguar XK120 of 1948. The Mark 2 was available in 2.4, 3.4 and 3.8-litre engine capacities. James Taylor suggests four reasons why Jaguar boss Sir William Lyons might have decided to add yet another model to an already extensive Jaguar range:
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| - Jaguar 420 and Daimler Sovereign
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| - 1966(xsd:integer)
- Daimler Sovereign – 5,824
- Jaguar 420 – 10,236
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| - The 420/Sovereign traces its origins back to the Jaguar Mark 2, which was introduced in 1959 and sold through most of the 1960s. The Mark 2 had a live rear axle and was powered by the XK six-cylinder engine first used in the Jaguar XK120 of 1948. The Mark 2 was available in 2.4, 3.4 and 3.8-litre engine capacities. In 1961 Jaguar launched two new models with the triple SU carburettor version of the 3.8-litre XK engine; the Mark X (pronounced "mark ten") saloon and the E-Type sports car. Both cars used versions of Jaguar's new independent rear suspension; the Mark X having a -inch (mm) track and the E-Type a -inch (mm) track. In 1965 the Mark X and E-Type were updated with a new 4.2-litre version of the XK engine, still using triple carburettors. Meanwhile, in 1963 Jaguar had introduced the Jaguar S-Type as a development of the Mark 2. It used a new intermediate-width -inch (mm) version of the independent rear suspension in place of the live rear axle of the Mark 2. Other differences from the Mark 2 were extended rear bodywork to provide for a larger boot, a changed roofline for more rear seat passenger headroom, a slightly plusher interior and detail differences around the nose. The S-Type was available with either 3.4 or 3.8-litre XK engines (only 3.8-litre in USA) but in twin carburettor form because the triple carburettor setup would not readily fit into what was essentially still the Mark 2 engine bay. James Taylor suggests four reasons why Jaguar boss Sir William Lyons might have decided to add yet another model to an already extensive Jaguar range:
* sales of the Mark X were disappointing; the car was widely seen as being too big and cumbersome and a smaller car with similar standards of technical sophistication and luxury he thought could be more successful
* demands for more luxurious features would add weight to any future models, forcing the drive towards a 4.2-litre-engined compact saloon
* a combination of the 4.2-litre engine with the compact saloon body was expected to have market appeal
* aesthetic objections to the controversially styled S-Type were known to be harming its sales Consequently, Sir William initiated development of a new saloon based on the S-Type, retaining its 54-inch independent rear suspension but adding a twin carburettor version of the 4.2-litre powerplant and frontal styling more akin to that of the Mark X. The new car was released in August 1966 in the form of two badge-engineered models, named Jaguar 420 and Daimler Sovereign.
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