Saudi Arabia has allowed adult women to travel without permission and granted them more control over family matters,
A series of royal decrees published by the official newspaper stipulated that a Saudi passport should be issued to any citizen who applies for it and that any person above the age of 21 does not need permission to travel.
The amendments to regulations also grant women for the first time the right to register child birth, marriage or divorce and to be issued official family documents and be eligible as a guardian to children who are minors.
Saudi Arabia has long endured international criticism over the status of women, who rights groups say are often treated as second-class citizens under rules requiring them to get the consent of a male guardian for important decisions throughout their entire lives, regardless of age.
The kingdom's de facto ruler Crown Prince Mohammed has eased social restrictions, such as lifting a driving ban for women last year, as part of a push to open up the conservative Muslim kingdom and transform the economy.
Last year's murder of journalist Jamal Khashoggi at the hands of Saudi agents caused a global outcry, however, and the Gulf Arab state has been widely criticised for the arrest and alleged torture of nearly a dozen women activists.
Several high-profile cases of young women seeking asylum abroad on claims of gender-based repression have added further pressure on Riyadh over the male guardian system.
Guardianship's status between law and custom makes it a thorny issue for Prince Mohammed, who indicated last year he favoured ending the system but stopped short of endorsing its annulment.
Other parts of the system remain intact. Women still need permission from a male relative to marry or live on their own.
The decrees published today also covered employment regulations that would expand work opportunities for women, who represent a big portion of unemployed Saudis.
They stipulated that all citizens have the right to work without facing any discrimination based on gender, disability or age.
Prince Mohammed unveiled an ambitious plan in 2016 to transform the economy by 2030, which envisages increasing women's participation in the workforce to 30% from 22%.
Saudi Arabia ranked 141 of 149 countries in the 2018 Global Gender Gap, a World Economic Forum study on how women fare in economic and political participation, health and education.
Many Saudi officials say the fault lies in implementation and not government policy.
Without a codified system of law to go with the texts making up sharia, or Islamic law, the Saudi police and judiciary have long cited social customs in enforcing prohibitions on women.
Many aspects of guardianship stem from informal practice.
The prince has pushed back against the religious establishment, including by arresting scores of clerics and dissidents.