Guru Angad (31 March 1504 – 29 March 1552) was the second of the ten Sikh gurus. He was born with birth name Lehna, in the village of Harike (now Sarae Naga, near Muktsar) in northwest Indian subcontinent. Bhai Lehna's father was a small scale trader, he himself used to work as a pujari (priest) and religious teacher centered around Hindu goddess Durga. After he met Guru Nanak, the founder of Sikhism, he renounced his own faith and instead became a Sikh. He served and worked with Guru Nanak for many years. Having subjected Lehna's discipleship to various tests over the years, Guru Nanak gave Bhai Lehna the name Angad ("My own limb") , and in 1539 designated him as Guru Angad, the second guru of the Sikhs, instead of choosing one of his own sons.
Guru Angad continued the work started by the first Sikh Guru. He also adopted and formalized the Gurmukhi alphabet from pre-existing Indo-European scripts such as the Tankre of the Himalayan region. He began the process of collecting the spiritual hymns of Nanak, and contributed 62 hymns of his own. Instead of his own son, he chose Amar Das as his successor and the third Guru of Sikhism.
Guru Angad was born in a village, with birth name of Lehna, to Hindu parents living in northwestern part of the Indian subcontinent called the Punjab region. He was the son of a small but successful trader named Pheru Mal. His mother's name was Mata Ramo (also known as Mata Sabhirai, Mansa Devi and Daya Kaur). Like all the Sikh Gurus, Lehna came from Khatri caste. Guru Angad Dev ji was born on 31 March 1504.
At age 16, Angad married a Khatri girl named Mata Khivi in January 1520. They had two sons (Dasu and Datu) and one or two daughters (Amro and Anokhi), depending on the primary sources. The entire family of his father had left their ancestral village in fear of the invasion of Babar's armies. After this the family settled at Khadur Sahib, a village by the River Beas near what is now Tarn Taran.
Before becoming a Sikh and his renaming as Angad, Lehna used to be a Hindu religious teacher and priest who performed services focused on Goddess Durga. Bhai Lehna in his late 20s sought out Guru Nanak, became his disciple, and displayed deep and loyal service to his Guru for about six to seven years in Kartarpur.
Several incidents in the tradition describe reasons why Bhai Lehna was chosen by Guru Nanak over his own sons as his successor. One of these incidents is about a jug which fell into mud, and Guru Nanak asked his sons to pick it up. Guru Nanak's sons would not pick it up because it was dirty or menial a task. Then he asked Bhai Lehna, who however picked it out of the mud, washed it clean, and presented it to Guru Nanak full of water.
After having subjected Bhai Lehna's discipleship to several tests over the years, Guru Nanak touched him and renamed him Angad (from Ang, or part of the body) and named him as his successor and the second Nanak on 13 June 1539.
After the death of Guru Nanak on 22 September 1539, Guru Angad left Kartarpur for the village of Khadur Sahib (near Goindwal Sahib). This move may have been suggested by Guru Nanak, seeing the possibility that the succession to gurgaddi (seat of Guru) by Guru Angad could be disputed by the two sons of Guru Nanak: Sri Chand and Lakhmi Das. Guru Angad focused on the teachings of Nanak, and building the community through charitable works such as langar.
The second Mughal Emperor of India Humayun visited Guru Angad around 1540 after Humayun lost the Battle of Kannauj, and thereby the Mughal throne to Sher Shah Suri. According to Sikh hagiographies, when Humayun arrived in Khadur Sahib Guru Angad was sitting and listening to hymns of the sangat. The failure to greet the Emperor immediately angered Humayun. Humayun lashed out but the Guru reminded him that the time when you needed to fight when you lost your throne you ran away and did not fight and now you want to attack a person engaged in prayer. In the Sikh texts written more than a century after the event, Guru Angad is said to have blessed the emperor, and reassured him that someday he will regain the throne.
Before his death, Guru Angad, following the example set by Guru Nanak, nominated Guru Amar Das as his successor (The Third Nanak), instead of choosing his own son. Before he converted to Sikhism, Amar Das had been a religious Hindu (Vaishnava), when one day he heard Bibi Amro, the daughter of Guru Angad singing a hymn by Guru Nanak.  Amar Das learnt from her about Guru Angad, and with her help met the second Guru of Sikhism in 1539. From then on, Amar Das renounced his Vaishnava practice and became a disciple of Guru Angad, who was much younger than himself . 
Amar Das displayed relentless devotion and service to Guru Angad, including waking up in the early hours and fetching water for Guru Angad's bath, cleaning and cooking for the volunteers with the Guru, as well devoting much time to meditation and prayers in the morning and evening. Guru Angad named Amar Das as his successor in 1552, instead of naming his surviving son Shri Chand. Guru Angad died on 29 March 1552.
Guru Angad is credited in the Sikh tradition with the Gurmukhi script, which is now the standard writing script for Punjabi language in India, in contrast to Punjabi language in Pakistan where now an Arabic script called Nastaliq is the standard. The original Sikh scriptures and most of the historic Sikh literature have been written in the Gurmukhi script.
Guru Angad's script modified the pre-existing Indo-European scripts in northern parts of the Indian subcontinent. The script may have already been developing before the time of Guru Angad, because there is evidence that at least one hymn was written in acrostic form by Guru Nanak, which state Cole and Sambhi gives proof that the alphabet already existed.
Guru Angad started the tradition of Mall banara, where physical as well as spiritual exercises were held. He also wrote 62 or 63 Saloks (compositions), which together constitute about one percent of the Guru Granth Sahib, the primary scripture of Sikhism.
Guru Angad is notable for systematizing the institution of langar in all Sikh temple premises, where visitors from near and far, could get a free simple meal in a communal seating. He also set rules and training method for volunteers (sevadars) who operated the kitchen, placing emphasis on treating it as a place of rest and refuge, being always polite and hospitable to all visitors.
Guru Angad visited other places and centres established by Guru Nanak for the preaching of Sikhism. He established new centres and thus strengthened its base.
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7 September 1539 – 26 March 1552
Guru Amar Das